Call functions from re.sub

Question

This is a simple example:

import re

math=\'3+5\'
print re.sub(r\'<(.)>(\\d+?)\\+(\\d+?)\', int(r\'\\2\') + int(r\'\\3\'         


        

Answer 1

You need to use lambda function.

print re.sub(r'<(.)>(\d+?)\+(\d+?)', lambda m: str(int(m.group(2)) + int(m.group(3))), math)