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Passing info to function used in re.sub

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From: lis...@mostrom.pp.se (Jan Erik Moström)
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Subject: Passing info to function used in re.sub
Date: Sun, 03 Sep 2023 18:10:29 +0200
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by: Jan Erik Moström - Sun, 3 Sep 2023 16:10 UTC

I'm looking for some advice for how to write this in a clean way

I want to replace some text using a regex-pattern, but before creating replacement text I need to some file checking/copying etc. My code right now look something like this:

def fix_stuff(m):
# Do various things that involves for info
# that what's available in m
replacement_text = m.group(1) + global_var1 + global_var2
return replacement_text

and the call comes here

global_var1 = "bla bla"
global_var2 = "pff"

new_text = re.sub(im_pattern,fix_stuff,md_text)

The "problem" is that I've currently written some code that works but it uses global variables ... and I don't like global variables. I assume there is a better way to write this, but how?

= jem

Re: Passing info to function used in re.sub

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From: ram...@zedat.fu-berlin.de (Stefan Ram)
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by: Stefan Ram - Sun, 3 Sep 2023 16:53 UTC

=?utf-8?q?Jan_Erik_Mostr=C3=B6m?= <lists@mostrom.pp.se> writes:
>def fix_stuff(m):
> # that what's available in m
> replacement_text = m.group(1) + global_var1 + global_var2
> return replacement_text
....
>new_text = re.sub(im_pattern,fix_stuff,md_text)

You can use a closure:

import re

def make_replace( was_global_1, was_global_2 ):
def replace( matcher ):
return matcher.group( 1 )+ was_global_1 + was_global_2
return replace

replace = make_replace( "a", "b" )

print( re.sub( r'(.)', replace, 'x' ))

. Note how I wrote code one can actually execute.
You could have done this too!

Or, partial application:

import functools
import re

def replace( was_global_1, was_global_2, matcher ):
return matcher.group( 1 )+ was_global_1 + was_global_2

print( re.sub( r'(.)', functools.partial( replace, 'a', 'b' ), 'x' ))

"Everyone's head is a cheap movie show." -- Jeff G. Bone

devel / comp.lang.python / Passing info to function used in re.sub

Subject	Author
Passing info to function used in re.sub	Jan Erik Moström
Re: Passing info to function used in re.sub	Stefan Ram