run python in debug mode from terminal
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title: running python in debug mode from terminal: a comprehensive tutorial
introduction:
debugging is an essential part of software development that allows programmers to identify and fix issues in their code. python, a popular programming language, provides a built-in debugger called pdb (python debugger) that helps developers inspect and troubleshoot their code. in this tutorial, we'll explore how to run python in debug mode from the terminal using the pdb debugger.
prerequisites:
before we begin, ensure that python is installed on your system. you can download python from the official website: https://www.python.org/downloads/
step 1: create a python script
start by creating a simple python script that you want to debug. for example, let's create a script named "debug_example.py" with the following content:
this script defines a function add_numbers that adds two numbers and a main function that attempts to add two variables. notice the intentional error with num2 being a string instead of an integer.
step 2: run python in debug mode
open your terminal and navigate to the directory containing your python script. use the following command to run the script in debug mode:
this command invokes the pdb debugger, which will pause the execution of your script at the first line.
step 3: explore basic pdb commands
once the script is paused, you can use various pdb commands to inspect and control the execution. some essential commands include:
example:
step 4: set breakpoints
to focus on specific parts of your code, you can set breakpoints using the b command followed by the line number. for instance:
step 5: continue debugging
after setting breakpoints, use the c command to continue execution until a breakpoint is encountered.
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