本文实例讲述了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。分享给大家供大家参考。具体实现方法如下：

#!/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, search_string, file_filter)

希望本文所述对大家的Python程序设计有所帮助。