code: def TypeFactory(v):
      
  
      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)
docs: 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.