|
复制代码 代码如下:
"""This module contains code from
Think Python by Allen B. Downey
http://thinkpython.com
Copyright 2012 Allen B. Downey
License: GNU GPLv3 http://www.gnu.org/licenses/gpl.html
"""
import os
def walk(dirname):
"""Finds the names of all files in dirname and its subdirectories.
dirname: string name of directory
"""
names = []
for name in os.listdir(dirname):
path = os.path.join(dirname,name)
if os.path.isfile(path):
names.append(path)
else:
names.extend(walk(path))
return names
def compute_checksum(filename):
"""Computes the MD5 checksum of the contents of a file.
filename: string
"""
cmd = 'md5sum ' + filename
return pipe(cmd)
def check_diff(name1,name2):
"""Computes the difference between the contents of two files.
name1,name2: string filenames
"""
cmd = 'diff %s %s' % (name1,name2)
return pipe(cmd)
def pipe(cmd):
"""Runs a command in a subprocess.
cmd: string Unix command
Returns (res,stat),the output of the subprocess and the exit status.
"""
fp = os.popen(cmd)
res = fp.read()
stat = fp.close()
assert stat is None
return res,stat
def compute_checksums(dirname,suffix):
"""Computes checksums for all files with the given suffix.
dirname: string name of directory to search
suffix: string suffix to match
Returns: map from checksum to list of files with that checksum
"""
names = walk(dirname)
d = {}
for name in names:
if name.endswith(suffix):
res,stat = compute_checksum(name)
checksum,_ = res.split()
if checksum in d:
d[checksum].append(name)
else:
d[checksum] = [name]
return d
def check_pairs(names):
"""Checks whether any in a list of files differs from the others.
names: list of string filenames
"""
for name1 in names:
for name2 in names:
if name1 < name2:
res,stat = check_diff(name1,name2)
if res:
return False
return True
def print_duplicates(d):
"""Checks for duplicate files.
Reports any files with the same checksum and checks whether they
are,in fact,identical.
d: map from checksum to list of files with that checksum
"""
for key,names in d.iteritems():
if len(names) > 1:
print 'The following files have the same checksum:'
for name in names:
print name
if check_pairs(names):
print 'And they are identical.'
if __name__ == '__main__':
d = compute_checksums(dirname='.',suffix='.py')
print_duplicates(d)
您可能感兴趣的文章:- Python MD5文件生成码
- python 计算文件的md5值实例
- python文件的md5加密方法
- 利用Python生成文件md5校验值函数的方法
- Python基于hashlib模块的文件MD5一致性加密验证示例
- Python简单计算文件MD5值的方法示例
- Python使用MD5加密字符串示例
- Python的加密模块md5、sha、crypt使用实例
- Python常见加密模块用法分析【MD5,crypt模块】
- Python实现检测文件MD5值的方法示例
（编辑：安卓应用网）
【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!
|
