python - 删除双行或多行空并保留单行空

Question

我有一个包含多个空行的字符串，我想删除它们但保留一个换行符，例如：

Line one






Line two
Line three


Line Four

Line Five

我想要达到的就是这个结果

Line one

Line two
Line three

Line Four

Line Five

我应该使用什么方法？

标签： python

Answer 1

您可以使用正则表达式re.sub，尤其是：

>>> s = """Line one






Line two
Line three


Line Four

Line Five"""

>>> clean = re.sub(r"\n\n+", "\n\n", s)
>>> print(clean)
Line one

Line two
Line three

Line Four

Line Five