[Python] Python static class variable in nested class

I have a nested class that uses static vars to have class wide parameters and accumulators.

If I do it as a standalone class it works.

If I do a nested class and inherit the standalone class, it works.

But I can't get a nested class to have static class variables, the interpreter gets confused. What am I doing wrong?

Code snippet:

class Cl_static_parameter_standalone:
#static var common to all instances. Two uses: common settings, common accumulator
c_n_counter : int = 0

@staticmethod
def increment() -> int:
Cl_static_parameter_standalone.c_n_counter += 1
return Cl_static_parameter_standalone.c_n_counter

class Cl_some_class:

class Cl_static_parameter_inherited(Cl_static_parameter_standalone):
pass

class Cl_static_parameter_nested:
c_n_counter : int = 0

@staticmethod
def increment() -> int:
Cl_static_parameter_nested.c_n_counter += 1
return Cl_static_parameter_nested.c_n_counter

def __init__(self):
return

def do_something(self):

print(f"Execute Standalone: {Cl_static_parameter_standalone.increment()}")
print(f"Execute Inherited: {self.Cl_static_parameter_inherited.increment()}")
print(f"Execute Nested: {self.Cl_static_parameter_nested.increment()}")
return

my_instance = Cl_some_class()
my_instance.do_something()


Output:

Execute Standalone: 1
Execute Inherited: 2
Traceback (most recent call last):
File "stack_overflow_class_static_parameter.py", line 52, in
<module>
my_instance.do_something()
~~~~~~~~~~~~~~~~~~~~~~~~^^
File "stack_overflow_class_static_parameter.py", line 48, in
do_something
print(f"Execute Nested: {self.Cl_static_parameter_nested.increment()}")

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "stack_overflow_class_static_parameter.py", line 38, in
increment
Cl_static_parameter_nested.c_n_counter += 1
^^^^^^^^^^^^^^^^^^^^^^^^^^
NameError: name 'Cl_static_parameter_nested' is not defined. Did you mean: 'Cl_static_parameter_standalone'?

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