Tag: Python

Python try-except : When you are writing Python programs, sometimes things go wrong. Maybe you tried to open a file that doesn’t exist, or divided a number by zero.
Without handling these mistakes, your program will crash!
That’s where try-except comes in — your superhero cape for handling errors gracefully.

What is try-except?

try-except is a way to tell Python:

“Hey, try to run this code.
But if something goes wrong, don’t crash. Instead, do this other thing.”

Simple, right?

Basic Structure

try:
    # code that might cause an error
except:
    # code that runs if there is an error

Example 1: Handling Division

try:
    number = int(input("Enter a number: "))
    result = 10 / number
    print(f"Result is: {result}")
except:
    print("Oops! Something went wrong.")

✅ If you enter 2, it prints Result is: 5.0.
❌ If you enter 0, it says Oops! Something went wrong. (because you can’t divide by zero!)

Why Use try-except?

• Prevent crashing
• Give friendly messages to users
• Handle specific problems differently

Imagine your app crashing just because someone entered a wrong value… Not good! 🙈

Catching Specific Errors

You can catch specific types of errors!
This is more professional and safe.

Example:

try:
    number = int(input("Enter a number: "))
    result = 10 / number
    print(f"Result is: {result}")
except ZeroDivisionError:
    print("Cannot divide by zero!")
except ValueError:
    print("Please enter a valid number.")

👉 Now, Python knows what went wrong and responds smartly!

Bonus Tip: else and finally

You can add two more blocks:

• else: → Runs if no errors happen.
• finally: → Always runs no matter what.

Example:

try:
    number = int(input("Enter a number: "))
    result = 10 / number
except ZeroDivisionError:
    print("Cannot divide by zero!")
except ValueError:
    print("Please enter a valid number.")
else:
    print(f"Success! The result is {result}")
finally:
    print("Thanks for using our calculator!")