Running code on import from dynamically generated module

Question

I have used this SO answer to dynamically generate a module x and register it in sys.modules. I want a piece of code to run automatically when an import is called on this module. so for example I want print "you just imported module x". So it behaves like:

>>> import x
you just imported module x

How do I get this behavior?

why not put it in the module itself? i.e right before class Foo: in the example — Padraic Cunningham
– Padraic Cunningham, Commented Dec 4, 2015 at 19:08
Should this happen every time the module is imported? If so, you'll probably need to mess with import hooks to do that. — user2357112
– user2357112, Commented Dec 4, 2015 at 19:15
Padraic that doesn't give the desired behavior because the print code is executed when exec is called not when the module is imported. — Hamzeh Alsalhi
– Hamzeh Alsalhi, Commented Dec 4, 2015 at 19:37

Jared Mackey · Accepted Answer · 2015-12-04 19:09:18Z

0

To simply extend the example given in the selected answer you could something like this.

print "You just imported module {}".format(foo.Foo.__module__)

answered Dec 4, 2015 at 19:09

Jared Mackey

4,2085 gold badges36 silver badges53 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Hamzeh Alsalhi Over a year ago

If you do that and then run the line from the example exec foo_code in foo.__dict__ the print will happen as soon as you call exec this does not make it so the print runs on import foo

Jared Mackey Over a year ago

That would be true if that was in the module being imported. My understand is this code would go in the module doing the importing.

DeepSpace · Accepted Answer · 2015-12-04 19:10:56Z

0

Any "orphan" code (code that isn't written inside a class or a function, or inside an if __name__ == '__main__:' block) will be executed when you import the module.

answered Dec 4, 2015 at 19:10

DeepSpace

82.1k12 gold badges119 silver badges166 bronze badges

Collectives™ on Stack Overflow

Running code on import from dynamically generated module

2 Answers 2

2 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related