How to debug in Python and Colab

pdb

To start debugging

python -m pdb test.py

It is best to use (better than pdb)

pip install ipdb 
python -m pip install ipdb
python -m ipdb

or you can use:

import pdb
pdb.set_trace()

or

import pdb; pdb.set_trace()

Basically pdb has similart syntax like ipdb.

colab

import pdb
%pdb

debugging - How to step through Python code to help debug issues? - Stack Overflow

Debugging in Google Colab notebook

Useful commands:

• b: set a breakpoint

b 11 #this would set a breakpoint at line 11
b some_function # set breakpoint at function_name

• 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 (default: 11 lines including the line being executed)
• u: navigate up a stack frame
• d: navigate down a stack frame
• p: to print the value of an expression in the current context
• r: (return) execute code till it returns from the current function or hits another breakpoint
• w: (where) Shows the stacktrace i.e. the chain of functions
  that made it reach the current function
• a: (arguments) List of arguments passed and its values to the function
• q : (quit)Immediately stop execution and quit the debugger

You have basically two modules. pdb and ipdb

ipdb stands for interactive python debugger and is designed for colab .

ipdb

!pip install -Uqq ipdb
import ipdb

%pdb on

ipdb.set_trace()

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