Re: Passing info to function used in re.sub

[Peter J. Holzer via Python-list]

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.
|_|_) ||
| |   | h...@hjp.at |-- Charles Stross, "Creative writing
__/   | http://www.hjp.at/ |   challenge!"


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Re: Passing info to function used in re.sub

[Dieter Maurer via Python-list]

Jan Erik Moström wrote at 2023-9-3 18:10 +0200:
>I'm looking for some advice for how to write this in a clean way
> ...
>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?

You could define a class with a `__call__` method
and use an instance of the class as replacement.
The class and/or instance can provide all relevant information via
attributes.

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