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I'm making a module to simulate a neural network, speed is an issue so I've written it in c, basically you build the network in python, and then run call a simulate method that is pure c.

One thing I want to add is the ability to inject current into the network as it runs, for this I thought I would have the user define a method that takes no arguments and returns a double and the network could use this as a callback function, but then I figured this would slow down the network by calling a method written in python, then I remembered ctypes.

So I wanted to ask, is PyObject_CallObject(my_callback, NULL) any slower then calling a c function if my_callback is written in c?

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Last Post by OffbeatPatriot
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Of course it's slower. Whether or not it's slower enough to make any difference is the issue. For me, it's not.

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Do you know what the over head is? Also, using the ctypes module, or anything really, can I get a C function pointer?

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"Do you know what the over head is?"

I think I'll rephrase that. I'm fairly new to learning about the mechanisms of what makes python work so maybe this is a stupid question, but if a PyObject is basically a ctypes wrapper for a c function is the python interpreter ever used when I call PyObject_CallObject on it?

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