How to get the reference of a global class by name in Python

1 Useing Globals().

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1. Globals()['classname']  

Globals()['classname']

2 Using eval.

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1. eval('classname')  

eval('classname')

3 Using new-style classes,make up a base class that has a classmethod, something like this:

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1. class Parent(object):  
2.     @classmethod  
3.     def getSubClass(cls,name):  
4.         for c in cls.__subclasses__:  
5.             if c.__name__ == name:  
6.             return c  

class Parent(object):
    @classmethod
    def getSubClass(cls,name):
        for c in cls.__subclasses__:
            if c.__name__ == name:
            return c

Everything classes inherits this one, which will enable it possible to dynamically get the references of the sub-classes.

4 Using getattr(), if the module that the the class lives in is known.

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1. getattr(module,classname)  

getattr(module,classname)