How to delete copyright information in the header of java files using python

# -*- coding: utf8 -*- 
''''' 
删除java文件头部的版权等注释 
package之上的部分 
'''
import os 
import sys 
 
def delHeader(filepath): 
if os.path.exists(filepath) : 
file = open(filepath) 
lines = file.readlines() 
beforeTag = True
writer = open(filepath, 'w') 
for line in lines : 
if 'package' in line: 
beforeTag = False
if beforeTag == False: 
writer.write(line) 
 
if __name__ == '__main__': 
path='F:\\space\\xxx\\src'
list = os.walk(path, True) 
for dir in list: 
files = dir[2] 
for file in files : 
if '.java' in file : 
filepath = os.path.join(dir[0], file) 
print filepath 
delHeader(filepath) 
 
print 'Complete!!!!!!!!!!!!!!!'