3.3.6 使用difflib.context_diff函数

只想简单地比较一下文本之间是否有变化，就可以函数defflib.context_diff来实现。

例子：

#python3.4.3

import difflib

text1 = '''  1. Beautiful is better than ugly.
2. Explicit is better than implicit.
3. Simple is better than complex.
4. Complex is better than complicated.
'''.splitlines(keepends=True)

text2 = '''  1. Beautiful is better than ugly.
3.   Simple is better than complex.
4. Complicated is better than complex.
5. Flat is better than nested.
0. test
'''.splitlines(keepends=True)

for line in difflib.context_diff(text1, text2, 'fromfile', 'tofile',
'fromfiledate', 'tofiledate', 1, '\n'):
print(line)

结果输出如下：

*** fromfile fromfiledate

--- tofile tofiledate

***************

*** 1,5 ****

1. Beautiful is better than ugly.

! 2. Explicit is better than implicit.

! 3. Simple is better than complex.

! 4. Complex is better than complicated.

--- 1,6 ----

1. Beautiful is better than ugly.

! 3. Simple is better than complex.

! 4. Complicated is better than complex.

! 5. Flat is better than nested.

! 0. test

在每行头有！的，就表示此行已经作出改变。

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