Python Exception Handling Programs with Solutions

20 exception handling programs: catching specific errors, else and finally, raising and re-raising, custom exceptions, retries and safe input parsing. Each solution runs both the success path and the failure path so you can see every branch.

All programs

• #1Handle division by zero
  Write a Python program that divides two numbers and prints a friendly message when the divisor is 0.Easy
• #2Handle invalid integer input
  Write a Python program that converts text to an integer and reports invalid values.Easy
• #3Handle a missing dictionary key
  Write a Python program that reads a key from a dictionary and handles a missing key.Easy
• #4Handle an index out of range
  Write a Python program that reads a list item by index and handles invalid indexes.Easy
• #5Several except blocks
  Write a Python function that handles TypeError and ZeroDivisionError separately.Easy
• #6Catch several errors in one block
  Write a Python program that catches ValueError and TypeError in one except block.Easy
• #7Use the else block
  Write a Python program that uses else to run code only when no exception occurred.Easy
• #8Use the finally block
  Write a Python program that shows finally always runs.Easy
• #9Raise an exception
  Write a Python function that raises ValueError for an invalid age.Easy
• #10Custom exception class
  Write a Python program with a custom InsufficientBalanceError.Medium
• #11Log and re-raise
  Write a Python program that logs an error and then re-raises it to the caller.Easy
• #12Chain exceptions with raise from
  Write a Python program that converts a low-level error into a clearer one and keeps the cause.Medium
• #13Handle a missing file
  Write a Python program that opens a file and handles the case where it does not exist.Easy
• #14Retry on failure
  Write a Python program that retries an unreliable operation up to 3 times.Medium
• #15Use assert for checks
  Write a Python program that uses assert to check a condition and handles the AssertionError.Easy
• #16Ask until the input is valid
  Write a Python program that keeps asking for a number until a valid one is entered.Easy
• #17Print exception details
  Write a Python program that prints the type, message and line of a caught exception.Easy
• #18Clean-up with a context manager
  Write a Python program showing that a with block closes a file even when an error happens inside it.Easy
• #19Collect several errors
  Write a Python program that validates several fields and reports every error at once.Medium
• #20Exception hierarchy order
  Write a Python program showing why specific exceptions must be caught before general ones.Easy