How can I trace the functions call stack in a Python script?

Question

I am trying to debug some code written long ago, and due to the scarce documentation would like a way to trace the functions being called from execution to final output, possibly with which parameters they were called with. A sort of sys.traceback but in the case of no errors. It would also be nice to get the report as a HTML or another exportable format. Something along the lines of:

main()->class->run()->getData()->saveData()

I already looked at Can I trace all the functions/methods executing in a python script? but it doesn't answer the question as functions are not reportd.

trace with the --trace option does report function calls — Andrea Corbellini
– Andrea Corbellini, Commented Dec 14, 2015 at 12:01

John Zwinck · Accepted Answer · 2015-12-14 11:56:26Z

1

Try using pycallgraph or another "call graph" visualization tool.

answered Dec 14, 2015 at 11:56

John Zwinck

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1 Comment

Nelewout Over a year ago

I like this answer a lot. While it may not provide a lot of added value in a (simple) script, for larger projects, such a visualization tool can be invaluable. Exceptionally useful in development!

mhbashari · Accepted Answer · 2015-12-21 04:16:08Z

0

probably you need settrace function

CODE

import sys

def traceit(frame, event, arg):
    if event == "call":
        co = frame.f_code
        func_name = co.co_name
        print("event:", event,"of function",func_name)
    return traceit

def main():
    print ("In main")
    for i in range(5):
        print (i, i*3)
    print ("Done.")


sys.settrace(traceit)
main()

OUT PUT

event: call of function main
In main
0 0
1 3
2 6
3 9
4 12
Done.

edited Dec 21, 2015 at 4:16

answered Dec 14, 2015 at 12:18

mhbashari

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