py之difflib内置模块之文本对比_py diff -ewa对比文本-优快云博客

本文链接：https://blog.youkuaiyun.com/luxunlx123/article/details/101034730

difflib是Python标准库中的模块，用于文本差异对比，类似于Linux的diff命令。它支持生成可读性高的HTML差异文档，并在版本控制中发挥作用。该模块中的符号如'-'、'+'、' '、'?'和'^'分别表示不同情况的差异。splitlines()方法用于按行分割文本，可选择是否保留换行符。

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1.什么是difflib? 用来做什么?
difflib为python的标准库模块，无需安装。
作用时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。

2.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

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)

“”"
splitlines()按照行分割
返回一个包含各行作为元素的列表
参数：
keepends=True 保留换行符
keepends=False 不包含换行符

“”"
#实现类似linux里面的diff命令的功能

#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)