Explain the Python Try Except/Catch

Question

Anubhav Kumar · Answer

In Python, try and except are used for
exception handling — a way to deal with runtime errors (errors that occur while the program is running)
without crashing the program.
Basic Structure
try:
    # Code that might raise an error
    risky_operation()
except ExceptionType1:
    # Handle exception type 1
    ...
except ExceptionType2 as e:
    # Handle exception type 2
    ...
else:
    # Runs if no exception occurs
    ...
finally:
    # Runs no matter what (cleanup code)
    ...
When Python encounters an error inside the try block:
It immediately stops executing that block.It looks for a matching except block.If found, it runs the code inside except.If no match is found, the program crashes with an error message.
Example
try:
    x = int(input("Enter a number: "))
    print(10 / x)
except:
    print("An error occurred.")
If user enters 2:
5.0
If user enters 0 or "abc":
An error occurred.
Catching Specific Exceptions
It’s best practice to handle specific errors, not all errors blindly.
try:
    x = int(input("Enter a number: "))
    print(10 / x)
except ZeroDivisionError:
    print("You can’t divide by zero!")
except ValueError:
    print("Please enter a valid number!")
This helps you understand exactly what went wrong.
Using else
You can add an else block — it runs only if no exception occurs.
try:
    x = int(input("Enter a number: "))
    print(10 / x)
except ZeroDivisionError:
    print("You can’t divide by zero!")
else:
    print("No errors occurred, success!")
Using finally
The finally block always executes, no matter what happens (error or not).
It’s commonly used to release resources (like closing files or database connections).
try:
    f = open("data.txt")
    # Perform file operations
except FileNotFoundError:
    print("File not found.")
finally:
    f.close()
    print("File closed.")
Multiple Exceptions in One except
You can handle multiple errors in one line:
try:
    x = int(input("Enter a number: "))
    print(10 / x)
except (ZeroDivisionError, ValueError) as e:
    print("Error:", e)
Summary Table
Block
Purpose
try
Code that might cause an error
except
Handles the error
else
Runs only if no error occurs
finally
Always runs (cleanup, closing files, etc.)
Real-World Example
def read_file(filename):
    try:
        with open(filename, "r") as f:
            data = f.read()
            print(data)
    except FileNotFoundError:
        print("Error: File not found.")
    except PermissionError:
        print("Error: Permission denied.")
    else:
        print("File read successfully!")
    finally:
        print("Operation finished.")

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Explain the Python Try Except/Catch

Anubhav Kumar

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1 Answers

Basic Structure

Example

Catching Specific Exceptions

Using `else`

Using `finally`

Multiple Exceptions in One `except`

Summary Table

Real-World Example

Liked By

Block	Purpose
`try`	Code that might cause an error
`except`	Handles the error
`else`	Runs only if no error occurs
`finally`	Always runs (cleanup, closing files, etc.)