How does python multiply the matching number in a string by 2

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The repl parameter is a function

The following example multiplies the matching number in the string by 2:

Example

#! / usr/bin/python

Import re

# multiply the matching number by 2

Def double (matched):

Value = int (matched.group ('value'))

Return str (value * 2)

S = 'A23G4HFD567'

Print (re.sub ('? P\ d +)', double, s))

The output of the execution is:

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