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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def TypeFactory(v):
 """Ensure `v` is a valid Type. This function is used to convert user-specified types into internal types for the verification engine. It allows Type subclasses, Type subclass instances, Python type, and user-defined classes to be passed. Returns an instance of the type of `v`. Users should never access this function directly. """


    if v is None:
        return Nothing()
    elif issubclass(type(v), Type):
        return v
    elif issubclass(v, Type):
        return v()
    elif issubclass(type(v), type):
        return Generic(v)
    else:
        raise InvalidTypeError("Invalid type %s" % v)