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Python try…except

Python Tutorial

Introduction

Python Data Types & Oper...

Python Strings

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Python Tuples

Python Sets

Python Dictionaries

Conditional Statements

Python Loops

Python Functions

Python Modules

Python OOPS

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File Handling

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Python try…except

Python try...except

Sometimes, your program may face unexpected errors—like dividing by zero or getting a string instead of a number. That’s where exception handling helps. Python uses the try, except, else, and finally blocks to catch and manage errors without crashing the program..

try...except Block

The try block runs code that might cause an error.
If an error occurs, Python skips the rest of the try block and jumps to the except block.

				
					try:
    age = int(input("Enter your age: "))
except ValueError:
    print("Please enter a valid number.")

Output:

				
					Enter your age: twenty
Please enter a valid number.

try...except...else Block

If no error happens in the try block, the else block runs.

				
					try:
    marks = int(input("Enter your marks: "))
except ValueError:
    print("Marks must be a number.")
else:
    print("You entered:", marks)

Output Example 1:

				
					Enter your marks: 87
You entered: 87

Output Example 2:

				
					Enter your marks: eighty seven
Marks must be a number.

try...except...finally Block

The finally block always runs, no matter what happened before—whether an error occurred or not.

				
					try:
    num = int(input("Enter a number: "))
except ValueError:
    print("That’s not a number.")
else:
    print("Thanks for entering:", num)
finally:
    print("End of try-except example.")

Output Example 1:

				
					Enter a number: 15
Thanks for entering: 15
End of try-except example.

Output Example 2:

				
					Enter a number: fifteen
That’s not a number.
End of try-except example.

Summary

Use try to run code that may raise errors.
Use except to handle specific errors.
Use else to run code only when no error occurs.
Use finally for cleanup tasks—runs no matter what.

This makes your Python programs more stable and user-friendly, especially when dealing with inputs, files, or external data.