反向diff -u在python中

Question

我需要在python中编写一个模块，该模块获取unix diff -u命令的输出以及用于创建该输出并返回输出第二个文件的文件之一。

-u返回一个差异文件统一格式

任何人都可以向我解释，真正锄了解，统一格式的差异？

Answer 1

有谷歌的diff-match-patch库的python port：

与PIP安装它：

pip install diff-match-patch 

从Python解释器将补丁应用的一个例子：

>>> from diff_match_patch import diff_match_patch 
>>> old_version = '''# 
... # Mac OS X Notice 
... # 
... # This file is not used by the host name and address resolution 
... # or the DNS query routing mechanisms used by most processes on 
... # this Mac OS X system. 
... # 
... # This file is automatically generated. 
... # 
... nameserver 192.168.1.1 
... nameserver 8.8.8.8''' 
>>> patch='''@@ -8,4 +8,4 @@ 
... # This file is automatically generated. 
... # 
... nameserver 192.168.1.1 
... -nameserver 8.8.8.8 
... +nameserver 8.8.4.4''' 
>>> patchobj = diff_match_patch() 
>>> patches = patchobj.patch_fromText(patch) 
>>> patched_version, results = patchobj.patch_apply(patches, old_version) 
>>> print str(patched_version) 
# 
# Mac OS X Notice 
# 
# This file is not used by the host name and address resolution 
# or the DNS query routing mechanisms used by most processes on 
# this Mac OS X system. 
# 
# This file is automatically generated. 
# 
nameserver 192.168.1.1 
nameserver 8.8.4.4