Debugging in Python

Python has a debugger , which is available as a module called pdb . It supports setting conditional breakpoints , stepping through the source code one line at a time, stack inspection, and more.

import pdb msg = "this is a test" pdb.set_trace() print(msg)

Insert pdb.set_trace() anywhere and it will function as a breakpoint . When you execute the script by python test.py, you will in the debug mode. Some useful debugging commands:

b: set a breakpoint
c: continue debugging until you hit a breakpoint
s: step through the code
n: to go to next line of code
l: list source code for the current file
u: navigate up a stack frame
d: navigate down a stack frame
p: to print the value of an expression in the current context
q: quit

Running from command line of python interpreter.

python -m pdb scriptName.py

If you don't like spending time in debuggers, you can dump execution trace and analyse it later.

python -m trace -t scriptName.py install > debug.log

Next : What are literals in python?

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