NameError when using the Python debugger (ipdb)

Question

I'm trying to become more adept at using the debugger, and am following the examples given in http://www.onlamp.com/pub/a/python/2005/09/01/debugger.html. I'm currently trying this script:

#!/usr/bin/env python

import ipdb

def test_debugger(some_int):
    print "start some int>>", some_int
    return_int = 10 / some_int
    print "end some_int>>", some_int
    return return_int

if __name__ == "__main__":
    ipdb.run("test_debugger(0)")

However, if I run it and try to press n, I get a NameError:

> <string>(1)<module>()

ipdb> n
NameError: "name 'test_debugger' is not defined"

As I understand from https://docs.python.org/2/library/pdb.html#pdb.run, it should be possible to use the n(ext) command to run until the actual bug. Can someone explain what is going on here?

is there a difference between pdb and ipdb?

WhatsThePoint
– WhatsThePoint

2017-02-14 12:44:47 +00:00
Commented Feb 14, 2017 at 12:44 — WhatsThePoint
– WhatsThePoint, Commented Feb 14, 2017 at 12:44

Laurent S · Accepted Answer · 2017-02-14 12:57:37Z

2

From the docs you mention, the explanation links to https://docs.python.org/2/library/functions.html#eval.

It seems that your call to ipdb.run() does not provide a globals or locals dict, so test_debugger is not defined in the context of run.

You can make it work like this:

ipdb.run("test_debugger(0)", {'test_debugger': test_debugger})

answered Feb 14, 2017 at 12:57

Laurent S

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