python里使用difflib库的unified_diff来比较文本

在前面使用了Differ来比较文本的差异，这个函数比较之后，把所有文本再次进行了输出，包含没有变化的文本也输出了。如果你想只输出变化的文本，没有变化的文本尽量少输出，怎么办呢？可以使用unified_diff函数实现这个目标，例子如下：

#python 3.6
#蔡军生
#http://blog.csdn.net/caimouse/article/details/51749579
#
import difflib
from difflib_data import *

diff = difflib.unified_diff(
text1_lines,
text2_lines,
lineterm='',
)
print('\n'.join(diff))

结果输出如下：
--- 
+++ 
@@ -1,11 +1,11 @@
 Lorem ipsum dolor sit amet, consectetuer adipiscing
 elit. Integer eu lacus accumsan arcu fermentum euismod. Donec
-pulvinar porttitor tellus. Aliquam venenatis. Donec facilisis
-pharetra tortor.  In nec mauris eget magna consequat
-convalis. Nam sed sem vitae odio pellentesque interdum. Sed
+pulvinar, porttitor tellus. Aliquam venenatis. Donec facilisis
+pharetra tortor. In nec mauris eget magna consequat
+convalis. Nam cras vitae mi vitae odio pellentesque interdum. Sed
 consequat viverra nisl. Suspendisse arcu metus, blandit quis,
 rhoncus ac, pharetra eget, velit. Mauris urna. Morbi nonummy
 molestie orci. Praesent nisi elit, fringilla ac, suscipit non,
 tristique vel, mauris. Curabitur vel lorem id nisl porta
-adipiscing. Suspendisse eu lectus. In nunc. Duis vulputate
-tristique enim. Donec quis lectus a justo imperdiet tempus.
+adipiscing. Duis vulputate tristique enim. Donec quis lectus a
+justo imperdiet tempus.  Suspendisse eu lectus. In nunc.

比较一下，前面的输出：
  Lorem ipsum dolor sit amet, consectetuer adipiscing
  elit. Integer eu lacus accumsan arcu fermentum euismod. Donec
- pulvinar porttitor tellus. Aliquam venenatis. Donec facilisis
+ pulvinar, porttitor tellus. Aliquam venenatis. Donec facilisis
?         +

- pharetra tortor.  In nec mauris eget magna consequat
?                 -

+ pharetra tortor. In nec mauris eget magna consequat
- convalis. Nam sed sem vitae odio pellentesque interdum. Sed
?                 - --

+ convalis. Nam cras vitae mi vitae odio pellentesque interdum. Sed
?               +++ +++++   +

  consequat viverra nisl. Suspendisse arcu metus, blandit quis,
  rhoncus ac, pharetra eget, velit. Mauris urna. Morbi nonummy
  molestie orci. Praesent nisi elit, fringilla ac, suscipit non,
  tristique vel, mauris. Curabitur vel lorem id nisl porta
- adipiscing. Suspendisse eu lectus. In nunc. Duis vulputate
- tristique enim. Donec quis lectus a justo imperdiet tempus.
+ adipiscing. Duis vulputate tristique enim. Donec quis lectus a
+ justo imperdiet tempus.  Suspendisse eu lectus. In nunc.

是否发现少了很多。

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