Please see following code.
I added return when call func_C and func_B.
def func_A():
x = 1
y = 1
result_A = func_B(x, y)
print(result_A)
def func_B(x, y):
result_B = x + y
if result_B < 10:
return func_C(x, y)
return result_B
def func_C(x, y):
x = x + 1
y = y + 1
return func_B(x, y)
func_A()
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