On 2017-02-24 09:24, Steve D'Aprano wrote:
On Fri, 24 Feb 2017 11:19 am, Irv Kalb wrote:
Hi,
I have built a set of three classes:
- A super class, let's call it: Base
[...]
I would like to add is some "insurance" that I (or someone else who uses
my code) never instantiates my Base class, It is not intended to be
instantiated because some of the needed instance variables are only
created in the __init__ method of ClassA and ClassB.
class Base:
def __init__(self):
if type(self) is Base:
raise TypeError("cannot instantiate Base class")
Does that help?
D'oh! Never thought of that! :-)
The OP is using Python 2.7, so you'll need to use new-style classes:
class Base(object):
def __init__(self):
if type(self) is Base:
raise TypeError("cannot instantiate Base class")
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