Example code that uses python to implement the function of the wc command program

This article introduces the example code that uses python to implement the function of the wc command program. here, the basic code of python is used to implement the basic function of the wc command program in Linux.

#! /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 = 'word', action = 'store _ true', default = False, help = 'only count word') 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: sys. stderr. write ('% s: No such file or directory \ n' % fn) # calculate the total field if len (args)> 1 and not options when there are only multiple files. 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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