Python breakpoint() Function

The breakpoint() function in Python is used to pause the execution of your program and start the debugger. It helps you inspect variables, step through the code, and find issues easily.

Syntax

breakpoint()

Parameters:

• No arguments are required. Optional keyword arguments exist but are rarely used by beginners.

Returns:

• Nothing – it triggers the debugger session.

Example: Using breakpoint() in a Program

x = 5
y = 10
breakpoint()
result = x + y
print("Result is:", result)

--Return--
> file.py(3)<module>()->None
(Pdb)

When Python hits the breakpoint(), it pauses the program and opens the pdb debugger. You can now inspect variables:

• p x – prints the value of x
• p y – prints the value of y
• c – continue the program

Why Use breakpoint() Instead of pdb.set_trace()?

• breakpoint() is cleaner and built-in since Python 3.7+
• It respects environment variables like PYTHONBREAKPOINT
• Easier for beginners – no need to import anything

Use Cases

• Pausing code at a specific line during development
• Inspecting variable values to fix bugs
• Walking through the code step-by-step

Common Mistakes

• Using breakpoint() in production code – remove it before deploying
• Forgetting to continue the debugger using c (continue)
• Expecting visual tools – it’s a command-line debugger

Tip for Beginners

If you’re new to debugging, start with breakpoint() in simple scripts and practice commands like p, c, and q.

Summary

• breakpoint() lets you pause code and enter the debugger
• Great tool for inspecting variables and flow
• Available in Python 3.7 and later

Practice Task

Try this small script with a breakpoint() and inspect the value of total during debugging:

a = 15
b = 5
total = a * b
breakpoint()
print("Final answer is:", total)

Once you hit the breakpoint, type p total to see its value!