Copy constructor in python?

Question

Is there a copy constructor in python ? If not what would I do to achieve something similar ?

The situation is that I am using a library and I have extended one of t

Answer 1

I have a similar situation differing in that the new class only needs to copy attributes. Thus using @Dunham's idea and adding some specificity to @meisterluk's suggestion, @meisterluk's "copy_constructor" method could be:

from copy import deepcopy
class Foo(object):
    def __init__(self, myOne=1, other=None):
    self.two = 2
    if other <> None:
        assert isinstance(other, Foo), "can only copy instances of Foo"
        self.__dict__ = deepcopy(other.__dict__)
    self.one = myOne

def __repr__(self):
    out = ''
    for k,v in self.__dict__.items():
        out += '{:>4s}: {}, {}\n'.format(k,v.__class__,v)
    return out

def bar(self):
    pass

foo1 = Foo()
foo2 = Foo('one', foo1)

print '\nfoo1\n',foo1
print '\nfoo2\n',foo2

The output:

foo1
 two: , 2
 one: , 1


foo2
 two: , 2
 one: , one