Example code for implementing the functionality of the WC command program using Python

Python's basic code is used here to implement the basic functions of the WC command program under the Linux system.

#!/usr/bin/env python#encoding:utf-8# author:liwei# FUNCTION:WC program by Python from Optparse import Optionparserimpo                      RT 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 informatio n ') options, args =Parser.parse_args () return options, args #print optionsdef get_count (data): chars = len (data) words = Len (data.sp Lit ()) lines = Data.count (' \ n ') return lines, words, chars #if not options.chars and not options.words and not optio NS def PRINT_WC (options, lines, words, chars, fn): If options.lines:print lines, if OPTIONS.WORDS:PR int words, if options.chars:print chars, print fn def main (): options, args = opt () if not (optio              Ns.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_coun T (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 director Y '%fn else:sys.stderr.write ('%s:no such file or directory\n '% fn) # only multiple files are calculated when Tota L field 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) Prin T_WC (options, lines, words, chars, fn) if __name__ = = ' __main__ ': Main ()