Calling user function from module

[Nicolas Chaverou]

Hi guys,

I'm trying to implement a user callback mechanism;

I'm having a function in a predefined module called glm.utils :

def createNodeUserCallback(functionName, nodeName):
    callbackFunction = functionName + 'UserCallback'
    call = callbackFunction + '(\'' + nodeName + '\')'
    try:
        eval(call)
    except:
        mutils.warning('Error while calling Python user callback')

This function is called here and there with different parameters and expects our users to declare and source some functions

Those functions are sometimes declared in their own modules (not known from our side) or in the Maya Script Editor

Problem is those functions are not available from our glm.utils module.

Someone has an idea about how I could solve this ?

Thanks

---

 
+33 (0)2 99 27 21 44
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[Marcus Ottosson]

How about this, for the user:

import glm

def mycallback():
  print("Did it!")

glm.registerUserCallback(mycallback)

That way, your registerUserCallback can take and store the callback, regardless of whether it’s from the Script Editor or another module.

​

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[Justin Israel]

I definitely second the suggestion from Marcus and recommend to avoid trying to construct a text based expression to pass to eval. Inverting the design and offering a callback registration is much more flexible and reliable. 

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[Nicolas Chaverou]

Totally valid. Thanks for the suggestion, it's way easier and pythonic :)

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