how to run python in debug mode from terminal
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Title: Debugging Python Code from the Terminal: A Step-by-Step Tutorial
Introduction:
Debugging is an essential skill for every programmer. Python provides a powerful built-in debugger called pdb (Python Debugger), which allows you to step through your code, inspect variables, and identify and fix issues. In this tutorial, we'll explore how to run Python in debug mode from the terminal using the pdb debugger.
Step 1: Inserting Breakpoints:
Before we start debugging, let's insert breakpoints into our Python script. Breakpoints are specific points in your code where the debugger will pause execution, allowing you to examine the state of your program.
In the example above, we'll set breakpoints at the beginning of the add_numbers function and just before the print statement in the main function.
Step 2: Running Python in Debug Mode:
Open your terminal and navigate to the directory containing your Python script. To run your script in debug mode, use the following command:
This command invokes the pdb debugger and loads your script. You will see the pdb prompt indicating that your program is paused.
Step 3: Exploring Basic pdb Commands:
Step 4: Using Breakpoints:
Now, set breakpoints at the desired locations within the debugger using the break command followed by the line number or function name:
Step 5: Continuing Execution:
Once breakpoints are set, type c to continue the execution until a breakpoint is encountered. The debugger will pause at the specified breakpoints, allowing you to inspect variables and step through your code.
Step 6: Inspecting Variables:
While paused at a breakpoint, you can use the p command to print the values of variables. For example:
Step 7: Exiting the Debugger:
To exit the debugger and terminate the program, type q at the pdb prompt.
Conclusion:
Debugging with pdb in Python's terminal is a valuable skill for identifying and fixing issues in your code. By following this tutorial, you've learned how to set breakpoints, run Python in debug mode, and use basic pdb commands to navigate through your code. Happy debugging!
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