我可以在数字中插入逗号吗？ 数字是字符串的一部分
[英]Can I insert comma into numbers? The numbers are parts of strings
问题描述
I want to do like this. 
我想这样 Do you know a good way? 你知道一个好方法吗？
import re
if __name__ == '__main__':
sample = "eventA 12:30 - 14:00 5200yen / eventB 15:30 - 17:00 10200yen enjoy!"
i_want_to_generate = "eventA 12:30 - 14:00 5,200yen / eventB 15:30 - 17:00 10,200yen enjoy!"
replaced = re.sub("(\d{1,3})(\d{3})", "$1,$2", sample) # Wrong.
print(replaced) # eventA 12:30 - 14:00 $1,$2yen / eventB 15:30 - 17:00 $1,$2yen enjoy!
2 个解决方案
解决方案1
5 已采纳 2017-07-19 11:40:25
You're not using the correct notation for your back-reference(s). 您没有为反向引用使用正确的符号。 You could also add a positive lookahead assertion containing the currency to ensure only those after the 'yen' are changed: 您还可以添加包含货币的正向超前断言，以确保仅更改'yen'之后的货币：
replaced = re.sub(r"(\d{1,3})(\d{3})(?=yen)", r"\1,\2", sample) # Wrong.
print(replaced)
# eventA 12:30 - 14:00 5,200yen / eventB 15:30 - 17:00 10,200yen enjoy!
解决方案2
1 2017-07-19 11:45:16
Use \\1 instead of $1 for substitution 使用\\1代替$1进行替换
Check: https://regex101.com/r/T2sbD2/1 检查： https ： //regex101.com/r/T2sbD2/1
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