I'm writing a class, where one of the methods is kinda complex. The
method uses a function which I know for certain will not be used
anywhere else. This function does not require anything from self, only
the args passed by the method.

Where should I put the function?

a) Inside the module but outside the class (to avoid cluttering it;
besides the function does not require to access any property or method
of the class).

# mymodule.py

def  _myfunction():
     ...

class myclass(object):
     def mymethod(self):
          ...
          spam = _myfunction()
    ...


b) Inside the class but outside the method

# mymodule.py

class myclass(object):
     def  _myfunction(self):
         ...

     def mymethod(self):
          ...
          spam = self._myfunction()
    ...

c) Inside the method:

# mymodule.py

class myclass(object):
     ...
     def mymethod(self):
         def  _myfunction(self):
                   ...
         ...
         spam = self._myfunction()
     ...


I'm new to python (and couldn't find anything about this in PEP 8).
What would you suggest me?

Thanks
Sergio
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