How to check whether a variable is a class or not?
Even better: use the inspect.isclass function.
>>> import inspect>>> class X(object):... pass... >>> inspect.isclass(X)True>>> x = X()>>> isinstance(x, X)True>>> inspect.isclass(x)False
>>> class X(object):... pass... >>> type(X)<type 'type'>>>> isinstance(X,type)True
The inspect.isclass is probably the best solution, and it's really easy to see how it's actually implemented
def isclass(object): """Return true if the object is a class. Class objects provide these attributes: __doc__ documentation string __module__ name of module in which this class was defined""" return isinstance(object, (type, types.ClassType))