Errors & debugging
Handle failures gracefully, raise helpful errors, and debug with confidence.
How to Use pdb.post_mortem in Python
Automatically enter the Python debugger at the exact point where an uncaught exception occurred, allowing interactive inspection of the crash site.
import pdb
import sys
def divide(a, b):
return a / b
def main():
try:
result = divide(10, 0)
print(f"Result: {result}")
except Exception:
# Enter post-mortem debugging when an uncaught exception occurs
pdb.post_mortem(sys.exc_info()[2])
if __name__ == "__main__":
main…How to Use the breakpoint() Function for Interactive Debugging in Python
Insert a breakpoint() call into your code to drop into an interactive debugger session where you can inspect variables and step through execution.
def calculate_total(prices, discount=0):
"""Calculates total price with optional discount."""
subtotal = sum(prices)
breakpoint() # Interactive debugging session starts here
final_total = subtotal * (1 - discount)
return final_total
if __name__ == "__main__":
items = [25.50, 13.25, 9.99, 5.7…Browse by section
Each section groups closely related Python snippets.
Errors & debugging — Python code examples
What you will find here
This page collects errors & debugging snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.
Samples vs tutorials and challenges
Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.