[Python] what is best way to copy a class without using inheritance in Python [duplicate]

I want a class 'child' to inherit all the properties of class 'parent' but this is going to be the exception rather than the rule. In more than 95% of the cases this is not going to happen, so what is the best way in Python to have a child class copy all of the attributes of the parent? Right now, I'm doing it this way (see below) but I have a hunch that there is a better way to do this. In the example below, of course it's better for the child to simply inherit from the cool_class, but like I said, with my current code it's not feasible to do it that way.

class cool_class():
def __init__(self):
self.hey_you = 1



def copy_class(child, parent):

attributes = [x for x in parent.__dict__]
for attribute in attributes:
if not attribute.startswith("__"):
setattr(child, attribute, getattr(parent, attribute))

ins = cool_class()
ins.get_off_my_cloud = 1
ins2 = cool_class()
copy_class(ins2,ins)
assert ins2.get_off_my_cloud == 1

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