Python 101: Interactively learn how to program with Python 3/

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Stepping Through the Code

Stepping Through the Code

We'll cover the following...

If you want to step through your code one line at a time, then you can use the step (or simply “s”) command. Here’s a session for your viewing pleasure:

Javascript (babel-node)
C:\Users\mike>cd c:\py101
c:\py101>python -m pdb debug_test.py
> c:\py101\debug_test.py(4)<module>()
-> def doubler(a):
(Pdb) step
> c:\py101\debug_test.py(11)<module>()
-> def main():
(Pdb) s
> c:\py101\debug_test.py(16)<module>()
-> if __name__ == "__main__":
(Pdb) s
> c:\py101\debug_test.py(17)<module>()
-> main()
(Pdb) s
--Call--
> c:\py101\debug_test.py(11)main()
-> def main():
(Pdb) next
> c:\py101\debug_test.py(13)main()
-> for i in range(1,10):
(Pdb) s
> c:\py101\debug_test.py(14)main()
-> doubler(i)
(Pdb)

Here we start up the debugger and tell it to step into the code. It starts at the top and ...