[Python] pycharm erroneously marks seemingy undefined variable as 'error' (unresolved...

Pycharm (Pycharm 2022.3.3 Community Edition) shows an error (unresolved reference) in the code attached in the image. In the function "func_test1" the variable "a" seems to be ?shadowed? by the variable "a" of the object "obj". In the function "func_test2" there is no issue about the variable "anythingexcepta". Upon running the script, everything works just fine. The three prints are: 5, 12 and 22, just as expected (i am using python 3.9).

So my questions are:

1. Why does this error occur? Is it some kind of shadowing? (although the script runs just fine)
2. Why does it occur in "func_test1", but nor in "func_test2"?
3. Is the behaviour of pycharm intended behaviour, if yes, why?
4. Is there a way to get rid of this erroneous error, apart from naming the variable something else.

I made this test script to showcase the error, ran the script and it ran just fine. But i still have no idea, why the error shows in the first place.

here's the code of the test script:

class testClass:
def __init__(self, a):
self.a = a

def func_test1(a):
def func_inner1(obj):
obj.a += a
return func_inner1

def func_test2(anythingexcepta):
def func_inner2(obj):
obj.a += anythingexcepta
return func_inner2


obj = testClass(5)

func_1 = func_test1(7)
func_2 = func_test2(10)

print(obj.a)
func_1(obj)
print(obj.a)
func_2(obj)
print(obj.a)

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