前言
人生苦短，我用Python
1. Python环境的搭建
1.1 python解释器的安装
（1）到官网下载python解释器
下载地址：https://www.python.org/downloads/release/python-372/
注释： 这个解释器是3.7.2版本的
（2）开始安装python解释器
安装解释器非常简单，选择Install Now， 在把下面的环境变量打上对勾就ok了。如下如所示
1.2 pycharm的安装
工欲善其事，必先利其器。Pycharm是一种Python IDE（集成开发环境），带有一整套可以帮助用户在使用Python语言时 提高其效率的工具。 简单的说提高你写代码的速度，编写代码更爽更舒服。
（1）到官网下载Pycharm
下载地址：http://www.jetbrains.com/pycharm/download/#section=windows
小提示： Pythoncharm分为专业版（professional）和社区版（community）。专业版集成了一些框架和库，收费的，基础里用不到，社区版就够用了。
（2）开始安装pycharm
安装pycharm也非常简单，选好安装路径，我安装到D盘了。然后到达了如下图的界面，选择一个64位的桌面图标(shortcut)，再选择一个.py的联想，如下图所示。
2. Python基础语法
2.1 基本语法
直接上代码，一看就懂了
<code class="prism language-python has-numbering"><span class="token comment"># 这是一个输出语句 <span class="token keyword">print<span class="token punctuation">(<span class="token string">"Hello,World"<span class="token punctuation">) <span class="token triple-quoted-string string">""" 这是一个多行注释 """ <span class="token triple-quoted-string string">""" 这也是一个多行注释 """ <span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">== <span class="token comment"># 定义变量，储存数据TOM my_name <span class="token operator">= <span class="token string">"TOM" <span class="token keyword">print<span class="token punctuation">(my_name<span class="token punctuation">) <span class="token comment"># 定义变量，储存数据，这是一瓶冰红茶 icdTea <span class="token operator">= <span class="token string">"这是一瓶冰红茶" <span class="token keyword">print<span class="token punctuation">(icdTea<span class="token punctuation">) </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>
www#gaodaima.com来源[email protected]搞@^&代*@码)网搞代码
2.2 数据类型
来一个思维导图，简单明了
直接上代码，一看就懂了
<code class="prism language-python has-numbering"><span class="token comment"># 整型和浮点型
num1 <span class="token operator">= <span class="token number">1
num2 <span class="token operator">= <span class="token number">1.2
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(num1<span class="token punctuation">)<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(num2<span class="token punctuation">)<span class="token punctuation">)
<span class="token comment"># 这是一个字符串类型
a <span class="token operator">= <span class="token string">"hello,world!"
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(a<span class="token punctuation">)<span class="token punctuation">)
<span class="token comment"># 这是一个布尔类型
b <span class="token operator">= <span class="token boolean">True
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(b<span class="token punctuation">)<span class="token punctuation">)
<span class="token comment"># 这是一个列表类型
c <span class="token operator">= <span class="token punctuation">[<span class="token number">10<span class="token punctuation">,<span class="token number">20<span class="token punctuation">,<span class="token number">30<span class="token punctuation">]
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(c<span class="token punctuation">)<span class="token punctuation">)
<span class="token comment"># 这是一个元组类型
d <span class="token operator">= <span class="token punctuation">(<span class="token number">10<span class="token punctuation">,<span class="token number">20<span class="token punctuation">,<span class="token number">30<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(d<span class="token punctuation">)<span class="token punctuation">)
<span class="token comment"># 这是一个集合
e <span class="token operator">= <span class="token punctuation">{<span class="token number">10<span class="token punctuation">,<span class="token number">20<span class="token punctuation">,<span class="token number">30<span class="token punctuation">}
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(e<span class="token punctuation">)<span class="token punctuation">)
<span class="token comment"># 这是一个字典
f <span class="token operator">= <span class="token punctuation">{<span class="token string">"name"<span class="token punctuation">: <span class="token string">"TOM"<span class="token punctuation">,<span class="token string">"age"<span class="token punctuation">: <span class="token number">18<span class="token punctuation">}
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(f<span class="token punctuation">)<span class="token punctuation">)
</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>
小提示：还有个复数类型，就是用于表示数学中的复数，用 real + imagej表示
2.3 标识符与关键字
这里不多说，跟C语言和Java中的知识都差不多一样，提几个需要注意的地方。
标识符：
（1）由数字、字母、下划线组成
（2）不能数字开头
（3）不能使用内置关键字
（4）严格区分大小写
2.4 格式化输出
直接上代码，一看就懂
<code class="prism language-python has-numbering">age <span class="token operator">= <span class="token number">18
name <span class="token operator">= <span class="token string">"TOM"
weight <span class="token operator">= <span class="token number">75.5
stu_id <span class="token operator">= <span class="token number">1
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"今年我的年龄是%d" <span class="token operator">% age<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"我的名字叫%s" <span class="token operator">% name<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"我的体重是%.3f" <span class="token operator">% weight<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"我的体重是%03d" <span class="token operator">% stu_id<span class="token punctuation">) <span class="token comment"># 不够三位，用0补全
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"我的名字叫：%s ，我的年龄是：%d" <span class="token operator">% <span class="token punctuation">(name<span class="token punctuation">,age<span class="token punctuation">)<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"我的名字叫：%s，我的年龄是：%d" <span class="token operator">% <span class="token punctuation">(name<span class="token punctuation">,age<span class="token operator">+<span class="token number">1<span class="token punctuation">)<span class="token punctuation">) <span class="token comment"># 年龄加一岁
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"我的名字叫：%s，今年的年龄是：%d，我的体重是：%s，我的学号是：%03d" <span class="token operator">% <span class="token punctuation">(name<span class="token punctuation">,age<span class="token punctuation">,weight<span class="token punctuation">,stu_id<span class="token punctuation">)<span class="token punctuation">)
<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">=
name <span class="token operator">= <span class="token string">"TOM"
age <span class="token operator">= <span class="token number">18
weight <span class="token operator">= <span class="token number">75.5
<span class="token comment"># %s比较强大
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"我的名字叫：%s，我的年龄是：%s，我的体重是：%s" <span class="token operator">% <span class="token punctuation">(name<span class="token punctuation">,age<span class="token punctuation">,weight<span class="token punctuation">)<span class="token punctuation">)
<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">=
name <span class="token operator">= <span class="token string">"TOM"
age <span class="token operator">= <span class="token number">16
<span class="token comment"># 语法：f"{表达式}"
<span class="token comment"># 这样的输出格式更加高效和简洁
<span class="token keyword">print<span class="token punctuation">(f<span class="token string">"我的名字叫{name},我的年龄为{age}"<span class="token punctuation">)
</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>
小提示：
（1）务必掌握这种输出格式f"{表达式}" ，这种的输出格式更加高效简洁。f-格式化字符串是Python3.6中新增的格式化方法，这种方法更简单易读。
（2）常见的格式符号：%s （字符串） %d（有符号的十进制整数） %f（浮点数） %c（字符） 这几种是常见的格式符号，如果需要其他的再去查就好了。
2.5 转义字符和print的结束符
直接上代码，一看就懂
<code class="prism language-python has-numbering"><span class="token keyword">print<span class="token punctuation">(<span class="token string">"hello world"<span class="token punctuation">) <span class="token keyword">print<span class="token punctuation">(<span class="token string">"hello world"<span class="token punctuation">) <span class="token comment"># hello world直接换行输出 <span class="token keyword">print<span class="token punctuation">(<span class="token string">" hello"<span class="token punctuation">) <span class="token comment"># 前面输出空格再输出hello <span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">= <span class="token comment"># 在python中，print()默认自带end=" "这个换行结束符，用户可以按照需求更改结束符 <span class="token keyword">print<span class="token punctuation">(<span class="token string">"hello"<span class="token punctuation">, end<span class="token operator">=<span class="token string">" "<span class="token punctuation">) <span class="token keyword">print<span class="token punctuation">(<span class="token string">"world"<span class="token punctuation">) <span class="token keyword">print<span class="token punctuation">(<span class="token string">"hello"<span class="token punctuation">, end<span class="token operator">=<span class="token string">" "<span class="token punctuation">) <span class="token keyword">print<span class="token punctuation">(<span class="token string">"hello"<span class="token punctuation">) <span class="token keyword">print<span class="token punctuation">(<span class="token string">"hello"<span class="token punctuation">, end<span class="token operator">=<span class="token string">"..."<span class="token punctuation">) <span class="token keyword">print<span class="token punctuation">(<span class="token string">"world"<span class="token punctuation">) </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>
小提示：要记住print的结束符这个小知识点。
2.6 输入与数据类型转换
直接上代码，一看就懂
<code class="prism language-python has-numbering">passward <span class="token operator">= <span class="token builtin">input<span class="token punctuation">(<span class="token string">"请输入您的密码："<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(f<span class="token string">"您输入的密码是：{passward}"<span class="token punctuation">)
<span class="token comment"># input接收到的数据类型都是字符串
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(passward<span class="token punctuation">)<span class="token punctuation">)
<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==
num <span class="token operator">= <span class="token builtin">input<span class="token punctuation">(<span class="token string">"请输入一个数字："<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(num<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(num<span class="token punctuation">)<span class="token punctuation">)
<span class="token comment"># 强制转换为int类型
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(<span class="token builtin">int<span class="token punctuation">(num<span class="token punctuation">)<span class="token punctuation">)<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(<span class="token builtin">int<span class="token punctuation">(num<span class="token punctuation">)<span class="token punctuation">)<span class="token punctuation">)
<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">=
<span class="token triple-quoted-string string">"""
因为得到数据类型并不是程序想要的数据类型，这个时候需要借助数据类型转换的函数来转换
"""
num <span class="token operator">= <span class="token number">1
str1 <span class="token operator">= <span class="token string">"10"
<span class="token comment"># 1.将数据转换成浮点类型 float()
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(<span class="token builtin">float<span class="token punctuation">(num<span class="token punctuation">)<span class="token punctuation">)<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">float<span class="token punctuation">(num<span class="token punctuation">)<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">float<span class="token punctuation">(str1<span class="token punctuation">)<span class="token punctuation">)
<span class="token comment"># 2. 将数据转换成字符串型 str()
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(<span class="token builtin">str<span class="token punctuation">(num<span class="token punctuation">)<span class="token punctuation">)<span class="token punctuation">)
<span class="token comment"># 3. 序列转换成元组 tuple()
list1 <span class="token operator">= <span class="token punctuation">[<span class="token number">10<span class="token punctuation">,<span class="token number">20<span class="token punctuation">]
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(list1<span class="token punctuation">)<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(<span class="token builtin">tuple<span class="token punctuation">(list1<span class="token punctuation">)<span class="token punctuation">)<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">tuple<span class="token punctuation">(list1<span class="token punctuation">)<span class="token punctuation">) <span class="token comment"># (100, 200)
<span class="token comment"># 4. 将一个元组转换成序列 list()
t1 <span class="token operator">= <span class="token punctuation">(<span class="token number">100<span class="token punctuation">,<span class="token number">200<span class="token punctuation">)
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">list<span class="token punctuation">(t1<span class="token punctuation">)<span class="token punctuation">) <span class="token comment"># [100, 200]
<span class="token comment"># 5. eval() 计算在字符串中的有效Python表达式，并返回一个表达式。把字符串中的数据转换成他原本的类型
str3 <span class="token operator">= <span class="token string">"1"
str4 <span class="token operator">= <span class="token string">"2.1"
str5 <span class="token operator">= <span class="token string">"(10,20)"
str6 <span class="token operator">= <span class="token string">"[10,20]"
<span class="token keyword">print<span class="token punctuation">(<span class="token builtin">type<span class="token punctuation">(<span class="token builtin">eval<span class="token punctuation">(str3<span class="token punctuation">)<span class="token punctuation">)<span class="token punctuation">) <span class="token comment"># <class "int">
</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>
本文首发于python黑洞网，博客园同步更新
2.7 复合赋值运算符和逻辑运算符
总结几个常用算数运算符
（1）** 返回a的b次幂，比如 2 ** 3,结果位8
（2）% 取余
（3）// 取整除，返回商的整数部分。
总结几个常用复合赋值运算符
直接上代码，一看就懂
<code class="prism language-python has-numbering">a <span class="token operator">= <span class="token number">10 a <span class="token operator">+= <span class="token number">1 <span class="token keyword">print<span class="token punctuation">(a<span class="token punctuation">) <span class="token comment"># 11 b <span class="token operator">= <span class="token number">10 b <span class="token operator">*= <span class="token number">3 <span class="token keyword">print<span class="token punctuation">(b<span class="token punctuation">) <span class="token comment"># 30 <span class="token comment"># 注意：先算复合赋值运算符右侧的表达式，算复合赋值运算 c <span class="token operator">= <span class="token number">10 c <span class="token operator">+= <span class="token number">1 <span class="token operator">+ <span class="token number">2 <span class="token keyword">print<span class="token punctuation">(c<span class="token punctuation">) <span class="token comment"># 13 <span class="token comment"># 测试 d <span class="token operator">= <span class="token number">10 d <span class="token operator">*= <span class="token number">1 <span class="token operator">+ <span class="token number">2 <span class="token keyword">print<span class="token punctuation">(d<span class="token punctuation">) <span class="token comment"># 30 说明先算复合赋值运算符右侧的表达式，再算复合赋值运算 <span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">= <span class="token comment"># 逻辑运算符的运用 a <span class="token operator">= <span class="token number">0 b <span class="token operator">= <span class="token number">1 c <span class="token operator">= <span class="token number">2 <span class="token comment"># 1.and <span class="token keyword">print<span class="token punctuation">(<span class="token punctuation">(a <span class="token operator">< b<span class="token punctuation">) <span class="token operator">and <span class="token punctuation">(a <span class="token operator">< c<span class="token punctuation">)<span class="token punctuation">) <span class="token comment"># True <span class="token keyword">print<span class="token punctuation">(a <span class="token operator">> b <span class="token operator">and a <span class="token operator">< c<span class="token punctuation">) <span class="token comment"># False <span class="token comment"># 2.or <span class="token keyword">print<span class="token punctuation">(b <span class="token operator">> c <span class="token operator">or a <span class="token operator">< c<span class="token punctuation">) <span class="token comment"># True <span class="token comment"># 3.not <span class="token keyword">print<span class="token punctuation">(<span class="token operator">not a <span class="token operator">< b<span class="token punctuation">) <span class="token comment"># False <span class="token comment"># 程序员的习惯 <span class="token comment"># 加小括号为了避免歧义，增加优先级 </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>
3. Python常用语句
3.1 判断语句（if语句、if-else语句、if-elif语句）
直接上代码，一看就懂
<code class="prism language-python has-numbering"><span class="token keyword">if <span class="token boolean">True<span class="token punctuation">:
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"条件成立了"<span class="token punctuation">)
<span class="token comment"># 下面的代码没有缩进到if语句块，所以和if条件无关
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"这个代码执行吗？"<span class="token punctuation">)
<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">=
age <span class="token operator">= <span class="token number">20
<span class="token keyword">if age <span class="token operator">>= <span class="token number">18<span class="token punctuation">:
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"已经成年可以上网"<span class="token punctuation">)
<span class="token comment"># 注意：不缩进的语句，跟if语句没有关系了。
<span class="token keyword">print<span class="token punctuation">(<span class="token string">"系统关闭"<span class="token punctuation">)
<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==
<span class="token comment"># 注意：input接受用户输入的数据是字符串类型，这时需要转换为int类型才能进行判断
age <span class="token operator">=<span class="token builtin">int<span class="token punctuation">( <span class="token builtin">input<span class="token punctuation">(<span class="token string">"请输入您的年龄："<span class="token punctuation">)<span class="token punctuation">)
<span class="token keyword">if age <span class="token operator">>= <span class="token number">18<span class="token punctuation">:
<span class="token keyword">print<span class="token punctuation">(f<span class="token string">"您输入的年龄是{age},已经成年可以上网"<span class="token punctuation">)
<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==<span class="token operator">==
age <span class="token operator">=<span class="token builtin">int<span class="token punctuation">( <span class="token builtin">input<span class="token punctuation">(<span class="token string">"请输入您的年龄："<span class="token punctuation">)<span class="token punctuation">)
<span class="token keyword">if age <span class="token operator">>= <span class="token number">18<span class="token punctuation">:
<span class="token keyword">print<span class="token punctuation">(f<span class="token string">"您输入的年龄是{age},已经成年可以上网"<span class="token punctuation">)
<span class="token keyword">else<span class="token punctuation">:
<span class="token keyword">print<span class="token punctuation">(f<span class="token string">"你输入的年龄是{age}，小朋友，回家写作业去"<span class="token punctuation">)
<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-<span class="token operator">-
age <span class="token operator">= <span class="token builtin">int<span class="token punctuation">(<span class="token builtin">input<span class="token punctuation">(<span class="token string">"请输入您的年龄"<span class="token punctuation">)<span class="token punctuation">)
<span class="token keyword">if age <span class="token operator">< <span class="token number">18<span class="token punctuation">:
<span class="token keyword">print<span class="token punctuation">(f<span class="token string">"您输入的年龄是{age}，童工"<span class="token punctuation">)
<span class="token keyword">elif </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>
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转载请注明原文链接：【详细】Python基础
转载请注明原文链接：【详细】Python基础
