differentially loading a class at runtime

[Maurice LING]

Hi,

In normal circumstances, we know exactly which class to load and use
using compile time. But I am now faced with a situation whereby I need
to load a class differentially at runtime (the user can define which
class to load).

For example:

class a:
......

class b:
......

allowed = ['a', 'b']

'allowed' list will store the names of the alternative classes to use.
The alternative classes have the same set of methods but different
implementations.

How can I differentially use the classes at runtime?

Thanks
Maurice

 

[Michael Hoffman]

How can I differentially use the classes at runtime?

I'm not completely sure I understand what you want, but how about using
a dict instead of a list:

>>> class a: x = "foo" ....
>>> class b: x = "bar" ....
>>> allowed = dict(a=a, b=b)
>>> aobj = allowed['a']()
>>> aobj.x

'foo'