Debugging Python

Here are some options for how to inspect and debug Python code:

print

Add print statements to your code and rerun your program to view the output:

print('any', values, you_want, 'to see')

Python REPL

Instead of running your whole program, start a Python REPL session, and import and run just the portions of your code you want to inspect:

$ python
$ from my_module import my_function
$ my_function()

pdb

See my Pdb notes.

ipdb

• gotcha/ipdb • IPython-enabled pdb 🛠️
• Debugging with ipdb - the normal way • Muhammad Osama Arshad 📺
  • Debugging with ipdb - the better way • Muhammad Osama Arshad 📺
• Debugging “pytest” tests with “ipdb” debug mode • Michael Mintz 📺

# use ipdb instead of pdb
$ PYTHONBREAKPOINT=ipdb.set_trace python file.py

pudb

• …

# use pudb instead of pdb
$ PYTHONBREAKPOINT=pudb.set_trace python file.py

pdbpp

• pdbpp/pdbpp: pdb++ • A drop-in replacement for pdb 🛠️

ipython

• IPython Documentation • IPython docs 📚
• 5 Ways of Debugging with IPython • Piotr Świtowski 📖

jupyter

See my Jupyter notes.

VS Code debugger

Research 📚

• Python Debug Cheatsheet • Peter Xie 📖
• Debugging Python Like a Boss • Zapier 📖

Inbox

• Online Python Tutor • Online Compiler and Visual Debugger for Python, Java, C, C++, and JavaScript 🛠️
• snoop • A powerful set of Python debugging tools, based on PySnooper 🛠️
• birdseye • Graphical Python debugger which lets you easily view the values of all evaluated expressions 🛠️
• Python Debugging (PyCharm + VS Code) - How to use the PyCharm and VS Code debuggers, and how to use breakpoints and conditional breakpoints to track down where problems are coming from - mCoding