Python noob can't get class method to work

Question

I have a method in my Customer class called save_from_row(). It looks like this:

@classmethod
def save_from_row(row):
    c = Customer(         


        

Answer 1

The first argument to a classmethod is the class itself. Try

@classmethod
def save_from_row(cls, row):
    c = cls()
    # ...
    return c

or

@staticmethod
def save_from_row(row):
    c = Customer()
    # ...
    return c

The classmethod variant will enable to create subclasses of Customer with the same factory function.

Instead of the staticmethod variant, I'd usually use module-level functions.

Answer 2

You want:

@classmethod
def save_from_row(cls, row):

Class methods get the method's class as the first argument.