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

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o Passing info to function used in re.subPeter J. Holzer

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Re: Passing info to function used in re.sub

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From: hjp-python@hjp.at (Peter J. Holzer)
Newsgroups: comp.lang.python
Subject: Re: Passing info to function used in re.sub
Date: Mon, 4 Sep 2023 21:00:02 +0200
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 by: Peter J. Holzer - Mon, 4 Sep 2023 19:00 UTC
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On 2023-09-03 18:10:29 +0200, Jan Erik Moström via Python-list wrote:
> 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?

If you use fix_stuff only inside one other function, you could make it
local to that function so that it will capture the local variables of
the outer function:

import re

def demo():

local_var1 = "bla bla"
local_var2 = "pff"

def fix_stuff(m):
# Do various things that involves for info
# that what's available in m
replacement_text = m.group(1) + local_var1 + local_var2
return replacement_text

for md_text in ( "aardvark", "barbapapa", "ba ba ba ba barbara ann"):
new_text = re.sub(r"(a+).*?(b+)", fix_stuff, md_text)
print(md_text, new_text)

demo()

hp

--
_ | Peter J. Holzer | Story must make more sense than reality.
|_|_) | |
| | | hjp@hjp.at | -- Charles Stross, "Creative writing
__/ | http://www.hjp.at/ | challenge!"

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

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