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  1. import re
  2. myString = '''fontSize="12px" and marginLeft="19px" and paddingTop="10px"'''
  3. print(re.sub(r'(\d+)px', lambda m: "{}px".format(int(m.group(1)) / 2), myString))
Success #stdin #stdout 0s 9024KB
stdin
Standard input is empty
stdout
fontSize="6px" and marginLeft="9px" and paddingTop="5px"