如何以统一的diff格式打印两个多行字符串的比较？ [英] How to print the comparison of two multiline strings in unified diff format?

问题描述

您知道有什么库可以帮助您做到这一点吗？

Do you know any library that will help doing that?

我将编写一个函数，以统一的diff格式打印两个多行字符串之间的差异。像这样的东西：

I would write a function that prints the differences between two multiline strings in the unified diff format. Something like that:

def print_differences(string1, string2):
    """
    Prints the comparison of string1 to string2 as unified diff format.
    """
    ???

使用示例如下：

string1="""
Usage: trash-empty [days]

Purge trashed files.

Options:
  --version   show program's version number and exit
  -h, --help  show this help message and exit
"""

string2="""
Usage: trash-empty [days]

Empty the trash can.

Options:
  --version   show program's version number and exit
  -h, --help  show this help message and exit

Report bugs to http://code.google.com/p/trash-cli/issues
"""

print_differences(string1, string2)

应该打印出以下内容：

--- string1 
+++ string2 
@@ -1,6 +1,6 @@
 Usage: trash-empty [days]

-Purge trashed files.
+Empty the trash can.

 Options:
   --version   show program's version number and exit

推荐答案

这是我的解决方法：

def _unidiff_output(expected, actual):
    """
    Helper function. Returns a string containing the unified diff of two multiline strings.
    """

    import difflib
    expected=expected.splitlines(1)
    actual=actual.splitlines(1)

    diff=difflib.unified_diff(expected, actual)

    return ''.join(diff)

这篇关于如何以统一的diff格式打印两个多行字符串的比较？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！