Try Except in Python
Exception handling lets a program recover from expected failures without hiding unrelated programming errors.
What is Try Except?
Exception handling lets a program recover from expected failures without hiding unrelated programming errors.
Handle invalid input with Python try, except, and finally.
When should you use it?
- Learn Python syntax through a practical example.
- Build a foundation for larger programming problems.
- Test an idea quickly without a local setup.
Example code
main.py
value = "not-a-number"
try:
number = int(value)
print(number)
except ValueError:
print("Please provide a valid integer")
finally:
print("Conversion finished")Expected output
Please provide a valid integer
Conversion finishedHow it works
The except clause handles a specific conversion error. Finally runs whether conversion succeeds or fails.
Change the values and run the program in the CodeUtility online Python compiler without installing Python locally.
Practice exercises
Modify the runnable example with the exercises below to build understanding beyond copying the result.
- Change the input and predict the output before running.
- Handle empty or invalid input.
- Wrap the logic in a function and add more test cases.