为什么Python中difflib库中的unified_diff方法遗漏了一些字符？

Question

我试着检查线条之间的差异。这是我的代码：

from difflib import unified_diff

s1 = ['a', 'b', 'c', 'd', 'e', 'f']
s2 = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'i', 'k', 'l', 'm', 'n']

for line in unified_diff(s1, s2):
    print line

它打印：

^{pr2}$

“a”、“b”和“c”怎么了？谢谢！在

Answer 1

如果您查看unified_diff代码，您将找到一个名为n的参数的描述：

Unified diffs are a compact way of showing line changes and a few lines of context. The number of context lines is set by 'n' which defaults to three.

在您的例子中，n基本上表示字符数。如果给n赋值，那么您将得到正确的输出。此代码：

from difflib import unified_diff

s1 = ['a', 'b', 'c', 'd', 'e', 'f']
s2 = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'i', 'k', 'l', 'm', 'n']

for line in unified_diff(s1, s2,n=6):
    print line

将产生：

^{pr2}$