Python Debugger Cheatsheet



My primary debugging tool is to add print statements to my programs. Print statements are very easy to use and they work well for any simple scripts. But that’s the catch: if you’re debugging an application and/or a test file, print statements won’t be enough or will just not work (in the case if tests files).

  • Python statements can also be prefixed with an exclamation point (!). This is a powerful way to inspect the program being debugged; it is even possible to change a variable or call a function. When an exception occurs in such a statement, the exception name is printed but the debugger’s state is not changed. The debugger supports aliases. Aliases can have parameters which allows one a certain level of adaptability to the context under examination.
  • Exhaustive, simple, beautiful and concise. A truly Pythonic cheat sheet about Python programming language.

For those cases, I find that pdb, the debugger that is part of Python’s standard library, is the next best thing: also very simple to use but gives you more insight on what’s going on in your program.

. Python 2.4 Reference Card (cheatsheet) by Laurent Pointal, designed for printing (15 pages). Online Python 2.2 Quick Reference by the New Mexico Tech Computer Center. Tip: From within the Python interpreter, type help, help( object ) or help(' name ') to get help. Welcome to Python Cheatsheet!¶ Welcome to pysheeet. This project aims at collecting useful Python snippets in order to enhance pythoneers’ coding experiences. Please feel free to contribute if you have any awesome ideas for improvements to code snippets, explanations, etc. Any snippets are welcome. The Python debugger pdb implements an interactive debugging environment that you can use with any of your programs written in Python. With features that let you pause your program, look at what values your variables are set to, and go through program execution in a discrete step-by-step manner, you can more fully understand what your program is doing and find bugs that exist in the logic or troubleshoot known issues.

Python Debugger Linux

All you have to do is to invoke pdb to enter in debug mode. It’s possible to either call the script with pdb as in:

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Python Debugger Cheatsheet

or call pdb inside the script where you want to stop regular execution and start debugging – for python 3.6 and older:

Or for python 3.7 and up:

When in debugging mode you have access to the pbd console, where you can use pdb commands (listed below) and also inspect your script – like printing variable contents, for example (just type the variable’s name in the console).

Example:

Online Python Debugger

In the short script above, once the debugger console is launched, you can hit ‘n’ to reach the next line, then type ‘nb’ to read its value at that point of execution.

Python

Personally, the most used pdb commands are the listed below but you can find the full list in the official documentation or in this free cheat sheet:

Cheatsheet

s(tep): Execute the current line, stop at the first possible occasion

Python Debugger Cheatsheet

c(ont(inue)): Continue execution, only stop when a breakpoint is encountered. Nier ps3 pkg.

n(ext): Continue execution until the next line in the current function is reached or it returns

Python Debugger Cheatsheet

r(eturn): Continue execution until the current function returns.q(uit): Quit from the debugger. The program being executed is aborted.

Free Python Debugger

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