python实现搜索指定目录下文件及文件内搜索指定关键词的方法

#!/usr/bin/python -O
# -*- coding: UTF-8 -*-
"""
Sucht rekursiv in Dateiinhalten und listet die Fundstellen auf.
"""
__author__ = "Jens Diemer"
__license__ = """GNU General Public License v2 or above -
 http://www.opensource.org/licenses/gpl-license.php"""
__url__ = "http://www.jensdiemer.de"
__version__ = "0.1"
import os,time,fnmatch
class search:
  def __init__(self,path,search_string,file_filter):
    self.search_path = path
    self.search_string = search_string
    self.file_filter = file_filter
    print "Search '%s' in [%s]..." % (
      self.search_string,self.search_path
    )
    print "_" * 80
    time_begin = time.time()
    file_count = self.walk()
    print "_" * 80
    print "%s files searched in %0.2fsec." % (
      file_count,(time.time() - time_begin)
    )
  def walk(self):
    file_count = 0
    for root,dirlist,filelist in os.walk(self.search_path,followlinks=True):
      for filename in filelist:
        for file_filter in self.file_filter:
          if fnmatch.fnmatch(filename,file_filter):
            self.search_file(os.path.join(root,filename))
            file_count += 1
    return file_count
  def search_file(self,filepath):
    f = file(filepath,"r")
    content = f.read()
    f.close()
    if self.search_string in content:
      print filepath
      self.cutout_content(content)
  def cutout_content(self,content):
    current_pos = 0
    search_string_len = len(self.search_string)
    for i in xrange(max_cutouts):
      try:
        pos = content.index(self.search_string,current_pos)
      except ValueError:
        break
      content_window = content[ pos - content_extract : pos + content_extract ]
      print ">>>",content_window.encode("String_Escape")
      current_pos += pos + search_string_len
    print
if __name__ == "__main__":
  search_path = r"c:texte"
  file_filter = ("*.py",) # fnmatch-Filter
  search_string = "history"
  content_extract = 35 # Gr��e des Ausschnittes der angezeigt wird
  max_cutouts = 20 # Max. Anzahl an Treffer,die Angezeigt werden sollen
  search(search_path,file_filter)