How to debug Python (Django) using `breakpoint()` function?

How to debug Python (Django) using `breakpoint()` function?

Gaurav Sharma's photo
Gaurav Sharma
·May 12, 2022·

2 min read

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Introduction:

Debugging is the skill which I feel very few do it perfectly. But it is a must-have skill for every programmer.

In Python, you can easily debug your code with the help of python’s breakpoint() function.

Note: There are other ways to debug your Python code, the most common way is to use your IDE’s debugger such as PyCharm. VSCode also comes with a great built-in debugger.

Let’s do it:

Debugging starts by creating a breakpoint.

  • Create a breakpoint by inserting the breakpoint() function just before the suspected line.
a = 1
b = 0
breakpoint()
c = a/b  # ZeroDivisionError
  • Whenever the Python interpreter hits this breakpoint() method, it will pause the execution and wait for your response in the terminal.
  • In the terminal, you have a Python shell like interface called 'pdb shell', where you can access all the variables, function, etc. of the current execution context.
  • There are some shortcut keys for navigating in the ‘pdb shell’. For listing all the shortcuts, you can use help command by entering h.

Note: breakpoint() only works above Python 3.7, to debug on older versions of Python, you should use 'pdb 'module as given in below example.

import pdb

a = 1
b = 0
pdb.set_trace()
c = a/b  # ZeroDivisionError

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