cProfile has no method runcall

Question

I'm trying to use cProfile to profile some python code. I believe I need to use cProfile.runcall(), not cProfile.run(), since the method I want to run is of the form self.funct() rather than simply funct().

When I try to use cProfile.runcall, detailed here, I get the following error:

AttributeError: 'module' object has no attribute 'runcall'

Has the runcall method been removed from cProfile? If so, is there an alternate method to use of the form cProfile.runcall(self.funct,*args)?

Minimum (not) working example:

import cProfile def funct(a): print a cProfile.runcall(funct,"Hello")

I recently discovered (the hard way) that the cProfile module isn't interchangeable with the profile module. In other words the first statement in the Python 2,7 documentation for them, that "Both the profile and cProfile modules provide the following functions: ...", is patently wrong—and the differences aren'y described anywhere (that I could locate). — martineau
– martineau, Commented Feb 7, 2018 at 18:22
@martineau I wondered about this, too, but I find it also doesn't work with profile. — PProteus
– PProteus, Commented Feb 7, 2018 at 18:29
PProteus: Oh, in this case it's your mistake. See the answer I just posted. — martineau
– martineau, Commented Feb 7, 2018 at 18:42

martineau · Accepted Answer · 2019-06-03 18:44:15Z

In this case, the problem is because runcall() is a method of a Profile class instance, not a module-level function (which is how your code is trying to use it). You need to construct an instance of one first, as shown in code snippet in the documentation.

This seems to work (in Python 2.7.14):

import cProfile def funct(a): print a pr = cProfile.Profile() pr.enable() pr.runcall(funct, "Hello")

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