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。