Recursive function returns None, when True is expected

Recursive function returns None, when True is expected - Printable Version

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Recursive function returns None, when True is expected - akar - Sep-07-2020

Hi,
I'm learning Python, I guess this must be absolutely silly but it's been driving me mad for hours.

I've simplified a lot from the original problem, and I can't understand how this function returns None in many cases:

def funk(a, b):
    print(a, b)
    if a == (b * 0.10):
        print('flag')
        return True
    elif a > 0.25:
        a -= 0.25
        b -= 1
        funk(a, b)
    else:
        return False

For example with a = 1.25 and b = 8, the output is:

Output:1.25 8
1.0 7
0.75 6
0.5 5
flag

It displays 'flag' but eventually returns None and not True as I would expect.
However, it returns True for other values like a = 1 and b = 10.

I've made other tests and could never get it returning False.

Why? Thanks for any help to figure it out.

Eventually I've found the solution...

line 9:

return funk(a, b)

Sorry for inconvenience...