Python -在句号后加空格;对一个十进制数来说不是

Question

使用Python和regex，请帮助转换

First sentence.Second sentence. Third 3.4 sentence3.Fourth sentence. Fifth5. Sixth.

First sentence. Second sentence. Third 3.4 sentence3. Fourth sentence. Fifth5. Sixth.

。，当两个字母之间有一个字符是字母时，需要插入空格。如果句点两边都是数字，则不需要插入空格。请帮助。

提前感谢。

Answer 1

可以使用负向前看断言来确保句点后面没有空格、$或任何数字。您可以使用re.sub将出现的句点替换为句点后面的空格。

>>> import re
>>> text = 'First sentence.Second sentence. Third 3.4 sentence3.Fourth sentence. Fifth5. Sixth.'
>>> re.sub('.(?!s|d|$)', '. ', text)
'First sentence. Second sentence. Third 3.4 sentence3. Fourth sentence. Fifth5. Sixth.'