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debugging is a crucial skill for every programmer, and python provides powerful tools for identifying and fixing issues in your code. in this tutorial, we'll explore how to debug python scripts using the command line and the built-in pdb (python debugger) module.
before we start, ensure that you have python installed on your system. additionally, make sure to have a python script with potential bugs that you want to debug.
the pdb module is python's built-in debugger. to use it, you need to import it into your script. open your python script and add the following line at the beginning:
breakpoints are markers that tell the debugger to pause the execution of your code at a specific line. to set a breakpoint, insert the following line where you want the execution to pause:
this line acts as a breakpoint, and when your script reaches it, the debugger will be activated.
save your changes and run your script in debug mode. open a command line terminal, navigate to the directory containing your script, and execute the following command:
replace your_script.py with the name of your python script.
once your script is running in debug mode, the debugger prompt will appear. here are some useful commands:
n (next): execute the current line and stop at the first possible occasion (i.e., the next line in the current function).
c (continue): continue execution until the next breakpoint is encountered.
q (quit): stop the execution of the script and quit the debugger.
p (print): print the value of a variable. for example, p variable_name.
l (list): show the source code around the current line.
use the debugger commands to navigate through your code, inspect variables, and identify the source of the issue. once you've located the problem, make the necessary corrections to your code.
save your changes and exit the debugger by typing q. rerun your script without the debugger to ensure that the issues have been resolved.
debugging with pdb in the command line provides a powerful and in ...

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