这里使用了 python 的基本代码实现了 Linux 系统下 wc 命令程序的基本功能。
#!/usr/bin/env python#encoding: utf-8# Author: liwei# Function: wc program by python from optparse import OptionParserimport sys,os def opt(): parser = OptionParser() parser.add_option('-c', '--char', dest='chars', action='store_true', default=False, help='only count chars') parser.add_option('-w', '--word', dest='words', action='store_true', default=False, help='only count words') parser.add_option('-l', '--line', dest='lines', action='store_true', default=False, help='only count lines') parser.add_option('-n', '--nototal', dest='nototal', action='store_true', default=False, help='don\'t print total information') options, args = parser.parse_args() return options, args #print optionsdef get_count(data): chars = len(data) words = len(data.split()) lines = data.count('\n') return lines, words, chars #if not options.chars and not options.words and not options def print_wc(options, lines, words, chars, fn): if options.lines: print lines, if options.words: print words, if options.chars: print chars, print fn def main(): options, args = opt() if not (options.lines or options.words or options.chars): options.lines, options.words, options.chars = True, True, True if args: total_lines, total_words, total_chars = 0, 0, 0 for fn in args: if os.path.isfile(fn): with open(fn) as fd: data = fd.read() lines, words, chars = get_count(data) print_wc(options, lines, words, chars, fn) total_lines += lines total_words += words total_chars += chars elif os.path.isdir(fn): print >> sys.stderr, '%s is a directory' %fn else: <b style="color:transparent">本文来源gao@!dai!ma.com搞$$代^@码!网!</b> sys.stderr.write('%s: No such file or directory\n' % fn) # 只有多个文件的时候会计算出total字段 if len(args) > 1 and not options.nototal: print_wc(options, total_lines, total_words, total_chars, 'total') else: fn = '' data = sys.stdin.read() lines, words, chars = get_count(data) print_wc(options, lines, words, chars, fn) if __name__ == '__main__': main()
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转载请注明原文链接：使用python实现wc命令程序的功能的实例代码
转载请注明原文链接：使用python实现wc命令程序的功能的实例代码
