[Python] How can I separate the functions of a class into multiple files?

I have a main class that has a ton of different functions in it. It's getting hard to manage. I'd like to be able to separate those functions into a separate file, but I'm finding it hard to come up with a good way to do so.

Here's what I've done so far:

File main.py


import separate

class MainClass(object):
self.global_var_1 = ...
self.global_var_2 = ...

def func_1(self, x, y):
...
def func_2(self, z):
...
# tons of similar functions, and then the ones I moved out:

def long_func_1(self, a, b):
return separate.long_func_1(self, a, b)

File separate.py


def long_func_1(obj, a, b):
if obj.global_var_1:
...
obj.func_2(z)
...
return ...
# Lots of other similar functions that use info from MainClass


I do this because if I do:

obj_1 = MainClass()

I want to be able to do:

obj_1.long_func_1(a, b)

instead of:

separate.long_func_1(obj_1, a, b)

I know this seems kind of nit-picky, but I want just about all of the code to start with obj_1., so there isn't confusion.

Is there a better solution that what I'm currently doing? The only issues that I have with my current setup are:

1. I have to change arguments for both instances of the function
2. It seems needlessly repetitive

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