Debugging Python code using breakpoint() and pdb

Difficulty Level : Medium
Last Updated : 23 Feb, 2019

While developing an application or exploring some features of a language, one might need to debug the code anytime. Therefore, having an idea of debugging the code is quite necessary. Let’s see some basics of debugging using built-in function breakpoint() and pdb module.

We know that debugger plays an important role when we want to find a bug in a particular line of code. Here, Python comes with the latest built-in function breakpoint which do the same thing as pdb.set_trace() in Python 3.6 and below versions.

Debugger finds the bug in the code line by line where we add the breakpoint, if a bug is found then program stops temporarily then you can remove the error and start to execute the code again.

Syntax:

1) breakpoint()           # in Python 3.72) import pdb; pdb.set_trace()   # in Python 3.6 and below

Method #1 : Using breakpoint() function
In this method, we simply introduce the breakpoint where you have doubt or somewhere you want to check for bugs or errors.

def debugger(a, b):

breakpoint()

result = a / b

return result

print(debugger(5, 0))

Output :

In order to run the debugger just type c and press enter.

Commands for debugging :

c -> continue executionq -> quit the debugger/executionn -> step to next line within the same functions -> step to next line in this function or a called function

Method #2 : Using pdb module
As the same suggests, PDB means Python debugger. To use the PDB in the program we have to use one of its method named set_trace(). Although this will result the same but this the another way to introduce the debugger in python version 3.6 and below.

def debugger(a, b):

import pdb; pdb.set_trace()

result = a / b

return result

print(debugger(5, 0))

Output :

In order to run the debugger just type c and press enter.

Example :

def debugger(a):

import pdb; pdb.set_trace()

result = [a[element] for element in range(0, len(a)+5)]

return result

print(debugger([1, 2, 3]))

Output :

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