How to debug in Python?

Answer:

Assume you have a simple python script like:

a = 1
b = 2
c = a + b
print c

To enable debugging, add the following line at the top of the program

import pdb

and in the line you want to break, add

pdb.set_trace()

So the whole program become:

import pdb
a = 1
b = 2
pdb.set_trace()
c = a + b
print c

When you execute the script by python test.py, you will in the debug mode.

Some useful commands:

1. Print variables: p a
2. Step over: n
3. Continue: c
4. Quit: q