python的difflib模块之文本对比

什么是difflib? 用来做什么?
difflib为python的标准库模块，无需安装。
作用是对比文本之间的差异。
并且支持输出可读性比较强的HTML文档，与Linux下的diff命令相似。
在版本控制方面非常有用。

符号理解

符号	含义
‘-’	包含在第一个系列行中，但不包含第二个。
‘+’	包含在第二个系列行中，但不包含第一个。
’ ’	两个系列行一致
‘?’	存在增量差异
‘^’	存在差异字符

文本

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.
		'''
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.
     '''

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.
     '''.splitlines(keepends=True)

# d = difflib.Differ()
# print(''.join(list(d.compare(text1,text2))))

d = difflib.HtmlDiff()
htmlContent = d.make_file(text1,text2)
# print(htmlContent)
with open('diff.html','w') as f:
    f.write(htmlContent)