[Python] Why and How Recursion X variable incease after satified 0 in the IF condition inside...

I understand the recursion function up until the point where the IF condition with zero is satisfied, which results in a return value of True. In the is_odd() function, the negation reverses this return value.

I try to understand it using a Python debugger. For a more detailed explanation, I uploaded a clip. Please watch it and focus on the local & watch sections on the left side of the vscode. Where X variable decreases until 0 and then increases until invoking value. Here is a YouTube short Clip link: https://www.youtube.com/watch?v=zUbZDCUkwa0&t=15s

However, I'm curious about how and why the variable X increases (e.g., from 0 to 1, 2, 3, 4, 5) after the IF condition returns True and more things it enters in ELSE condition until it reaches the invoked value of either 5 or 7.

I would appreciate it if you could explain this to me.

Here is the code:

def is_even(x):
if x == 0:
bol = True
return bol
else:
ahOdd = x-1
rtn = is_odd(ahOdd)
return rtn

def is_odd(x):
ahEven = is_even(x)
return not ahEven

invokingOdd = is_odd(5)
invokingEven = is_even(7)
print(invokingOdd)
print(invokingEven)




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