python - 拆分字符串并用成分替换原始字符串

Question

假设我用字符串“Taco>Bell”读入了一个输入文件，我想用“Taco>”和“Bell”替换那个字符串。换句话说，我想用两个替换一个字符串。我知道如何使用带有正则表达式的 split 方法来拆分字符串，但是如何执行替换呢？

每次有一个字符串有一个 ">" 后跟一个非空格字符，我想在字符之间插入一个空格。

Answer 1

在这种情况下，您需要向前看，如下所示：

import re

mystring = "John likes to eat Taco>Bell because it is Bar>Foo healthy third> ok."

print mystring

mystring = re.sub(r">(?! )", "> ", mystring)

print mystring

>基本上，只有在 之后的字符不是空格时才会发生替换。

输出：

John likes to eat Taco>Bell because it is Bar>Foo healthy third> ok.
John likes to eat Taco> Bell because it is Bar> Foo healthy third> ok.

Answer 2

一个可能的非正则表达式解决方案是

>>> somestr.replace(">","> ").replace(">  ","> ")
'John likes to eat Taco> Bell because it is Bar> Foo healthy third> ok.'