Python Exception Handling

📘 Python 👁 77 views 📅 Nov 05, 2025

⏱ Estimated reading time: 2 min

Python Exception Handling

Exception handling in Python is used to handle errors gracefully without stopping the program. Python uses try, except, else, and finally blocks for this purpose.

try block:
The code that may cause an error is placed inside a try block.
Example:
try:
x = 10 / 0

except block:
Handles the exception if it occurs.
Example:
try:
x = 10 / 0
except ZeroDivisionError:
print("Cannot divide by zero")

Catching multiple exceptions:
You can handle different exceptions in separate except blocks.
Example:
try:
x = int(input("Enter number: "))
y = 10 / x
except ValueError:
print("Invalid input")
except ZeroDivisionError:
print("Cannot divide by zero")

Using a single except for multiple exceptions:
Example:
try:
x = int(input("Enter number: "))
y = 10 / x
except (ValueError, ZeroDivisionError):
print("Error occurred")

else block:
The else block runs if no exception occurs in the try block.
Example:
try:
x = int(input("Enter number: "))
except ValueError:
print("Invalid input")
else:
print("You entered:", x)

finally block:
The finally block always executes, whether an exception occurs or not.
It is commonly used to close resources.
Example:
try:
file = open("data.txt", "r")
except FileNotFoundError:
print("File not found")
finally:
print("Execution finished")

Raising exceptions manually:
Use raise to trigger an exception intentionally.
Example:
x = -5
if x < 0 data-start="1731" data-end="1734"> raise ValueError("Negative value not allowed")

Custom exceptions:
You can create custom exception classes by inheriting from the Exception class.
Example:
class MyError(Exception):
pass
x = 10
if x > 5:
raise MyError("x cannot be greater than 5")

🔒 Some advanced sections are available for Registered Members
Register Now

← Previous