python实操（1）：搜索指定目录（文件）下包含指定字符串的文件，及行号

#!/usr/bin/python
#encoding:utf-8
#  Filename : findString.py
#author by :morespeech
#python2.7
#platform:pycharm

import os
import re
class cFindString:
####public functions
def __init__(self, filepattern , txtpattern):
self.filePattern = re.compile(filepattern)
self.txtParttern = re.compile(txtpattern)

def findStringInFile(self, filename):
if os.path.isdir(filename):
for subfilename in os.listdir(filename):
subfilename = os.path.join(filename, subfilename)
self.findStringInFile(subfilename)
else:
if not os.path.exists(filename):
print filename ,'not exist'
return
fileHandle = open(filename, 'rb')
nLine = 0
for line in fileHandle:
search = self.txtParttern.search(line)
if search:
print filename ,'(',nLine, ')', line
nLine = nLine + 1
fileHandle.close()

g_stringPattern=''
g_filePattern=''
g_filename=''

def parse():
from optparse import OptionParser
usage = "usage:findString [opthions] -n=.cpp -s=\d\w -f 1.cpp"
parser = OptionParser(usage=usage)
parser.add_option("-n", "--filenamePattern", dest = "wantfilePattern",help="match file format, .cpp/.c/.py etc")
parser.add_option("-s", "--stringPattern", dest = "wantstringPattern", help="match string, regex etc")
parser.add_option("-f", "--filename", dest = "wantfilename", help="input the file or folder you want to find")

(options, args) = parser.parse_args()

if options.wantfilePattern and options.wantstringPattern and options.wantfilename:
global g_filePattern, g_stringPattern, g_filename
g_filePattern = options.wantfilePattern
g_stringPattern = options.wantstringPattern
g_filename = options.wantfilename
else:
parser.print_help()

if __name__== "__main__":
parse()
cFindString(g_filePattern, g_stringPattern).findStringInFile(g_filename)