CODEWITHSUNDEEP
pythonooppython-2.7superclass
Har
Har

Reputation: 3918

How do I concatenate many objects into one object using inheritance in python? (during runtime)

I have the following classes:

class hello(object):
    def __init__(self):
        pass

class bye(object):
    def __init__(self):
        pass

l = [hello, bye]

If I do the following I get an error:

>>> class bigclass(*l):
  File "<stdin>", line 1
    class bigclass(*l):
                    ^
SyntaxError: invalid syntax

Is there another way to do this automatically at runtime?

I am using Python 2.7.

Upvotes: 15

Views: 157

Answers (2)

Ashwini Chaudhary
Ashwini Chaudhary

Reputation: 250941

Using a Metaclass:

class Meta(type):

    def __new__(cls, clsname, bases, dct):
        bases = tuple(dct.pop('bases'))
        return type.__new__(cls, clsname, bases, dct)

class bigclass:

    __metaclass__ = Meta
    bases = l

print bigclass.__bases__
#(<class '__main__.hello'>, <class '__main__.bye'>)

Upvotes: 6

unutbu
unutbu

Reputation: 879471

You could use the 3-argument form of type to create the class:

bigclass = type('bigclass', (hello, bye), {})

Upvotes: 13

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