CODEWITHSUNDEEP
python
Bob Aman
Bob Aman

Reputation: 33249

How do I get the module instance for a class in Python?

I am learning Python, and as always, I'm being ambitious with my starter projects. I am working on a plugin system for a community site toolkit for App Engine. My plugin superclass has a method called install_path. I would like to obtain the __path__ for the __module__ for self (which in this case will be the subclass). Problem is, __module__ returns a str rather than the module instance itself. eval() is unreliable and undesirable, so I need a good way of getting my hands on the actual module instance that doesn't involve evalling the str I get back from __module__.

Upvotes: 15

Views: 9415

Answers (3)

u0b34a0f6ae
u0b34a0f6ae

Reputation: 49833

Alternatively, you can use the module's global __file__ variable if all you want is the module's path.

Upvotes: 1

Tom Leys
Tom Leys

Reputation: 19029

How about Importing modules

X = __import__(‘X’) works like import X, with the difference that you 1) pass the module name as a string, and 2) explicitly assign it to a variable in your current namespace.

You could pass the module name (instead of 'X') and get the module instance back. Python will ensure that you don't import the same module twice, so you should get back the instance that you imported earlier.

Upvotes: 1

Lukáš Lalinský
Lukáš Lalinský

Reputation: 41316

The sys.modules dict contains all imported modules, so you can use:

mod = sys.modules[__module__]

Upvotes: 15

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