使用Python实现Linux系统wc命令，效果一样

#!/usr/bin/python
#*-*coding:utf8*-*

import sys
import os
from optparse import OptionParser

"""定义参数"""
parser = OptionParser()
parser.add_option("-l", "--line",
dest="lines",
action="store_true",
default=False,
help="only count lines")
parser.add_option("-w", "--word",
dest="words",
action="store_true",
default=False,
help="only count words")
parser.add_option("-c", "--char",
dest="chars",
action="store_true",
default=False,
help="only count chars")
parser.add_option("-n", "--nototal",
dest="nototal",
action="store_true",
default=False,
help="no count total")
options, args = parser.parse_args()

"""根据指定不同选项显示不同的值"""
def display(l, w, c):
global total_l
total_l += l
global total_w
total_w += w
global total_c
total_c += c
if not (options.words or options.chars or options.lines):
print(l),
print(w),
print(c),
if options.lines:
print(l),
if options.words:
print(w),
if options.chars:
print(c),

"""针对文件特殊处理，如果是1个文件以上那么需要输入一个Total总和"""
def dir(data):
if not os.path.exists(data):
sys.stderr.write("%s No such file or directory\n" %data)
return False
if os.path.isdir(data):
sys.stderr.write("%s Is a directory\n" %data)
return False
return True

def readFile(data):
for f in data:
b = dir(f)
if b:
with open(f) as files:
fd = files.read()
l = fd.count("\n")
w = len(fd.split())
c = len(fd)
display(l, w, c)
print(f)
else:
continue
if (len(args) > 1) and (not options.nototal):
l = total_l
w = total_w
c = total_c
display(l, w, c)
print("Total")

total_l = 0
total_w = 0
total_c = 0

if len(args) == 0:
data = sys.stdin.read()
l = data.count("\n")
w = len(data.split())
c = len(data)
display(l, w, c)
else:
data = args
readFile(data)