You can make a custom function which takes any number of argument and then these argument would use the format function to separate the large INT value, then append the modified args list as to print it later on using IC.
`from icecream import ic

Define a custom output function to format large integers with separators

def custom_output(*args, **kwargs):
new_args = []
for arg in args:
if isinstance(arg, int) and abs(arg) > 1000: # Check if arg is a large integer
arg = format(arg, ",") # Format large integers with commas
new_args.append(arg)
ic._print(*new_args, **kwargs)

Set the custom output function

ic.configureOutput(prefix='IC| ', outputFunction=custom_output)

Test the custom output function

ic(123456789) # This will output the formatted large integer with separators
ic("Hello", 987654321) # This will also format the large integer with separators
`
@jerabaul29 Kindly have a look at the proposed solution and close the issue. Thank you

from icecream.

Thanks for the comment. I see how this works / can work, but honestly this feels like a bit much ceremony to get this done - in this case, it is faster to use print with f-strings. I wonder if there would be a simple way to directly forward simple formatting instructions instead, that would be much lighter to use :) .

from icecream.

pprint.pformat has the underscore_numbers keyword, which outputs numbers with _ in between, like

123_456_789

This can be used with icecream by creating a custom argToString function:

ic.configureOutput(argToStringFunction=lambda *args: pprint.pformat(*args, underscore_numbers=True))

Note that this will only work for Python >=3.10 !

from icecream.