{"id":87,"date":"2026-03-01T17:38:07","date_gmt":"2026-03-01T12:38:07","guid":{"rendered":"https:\/\/gigz.pk\/python\/?post_type=lesson&p=87"},"modified":"2026-03-14T08:06:47","modified_gmt":"2026-03-14T03:06:47","slug":"try-and-except","status":"publish","type":"lesson","link":"https:\/\/gigz.pk\/python\/lesson\/try-and-except\/","title":{"rendered":"Try and Except"},"content":{"rendered":"\n

try<\/code> and except<\/code> are used for error handling in Python.
They prevent your program from crashing when an error occurs.<\/p>\n\n\n\n

Instead of stopping the program, Python executes the except<\/code> block.<\/p>\n\n\n\n

BASIC SYNTAX<\/strong><\/h2>\n\n\n\n
try:
    # code that may cause error
except:
    # code that runs if error occurs<\/pre>\n\n\n\n
SIMPLE EXAMPLE<\/strong><\/h2>\n\n\n\n
try:
    num = int(input(\"Enter a number: \"))
    print(10 \/ num)
except:
    print(\"An error occurred.\")<\/pre>\n\n\n\n
If the user enters 0<\/code> or text, the program will not crash.<\/p>\n\n\n\n
HANDLING SPECIFIC ERRORS<\/strong><\/h2>\n\n\n\n
It is better to handle specific exceptions.<\/p>\n\n\n\n
1. ZeroDivisionError<\/strong><\/h3>\n\n\n\n
try:
    print(10 \/ 0)
except ZeroDivisionError:
    print(\"You cannot divide by zero.\")<\/pre>\n\n\n\n
2. ValueError<\/strong><\/h3>\n\n\n\n
try:
    num = int(\"abc\")
except ValueError:
    print(\"Invalid input. Please enter a number.\")<\/pre>\n\n\n\n
MULTIPLE EXCEPT BLOCKS<\/strong><\/h2>\n\n\n\n
try:
    num = int(input(\"Enter number: \"))
    result = 10 \/ num
except ValueError:
    print(\"Invalid number.\")
except ZeroDivisionError:
    print(\"Cannot divide by zero.\")<\/pre>\n\n\n\n
Each error type is handled separately.<\/p>\n\n\n\n
USING AS e (SHOW ERROR MESSAGE)<\/strong><\/h2>\n\n\n\n
try:
    num = int(\"abc\")
except Exception as e:
    print(\"Error:\", e)<\/pre>\n\n\n\n
e<\/code> stores the actual error message.<\/p>\n\n\n\n
TRY \u2013 EXCEPT \u2013 ELSE<\/strong><\/h2>\n\n\n\n
The else<\/code> block runs if no error occurs.<\/p>\n\n\n\n
try:
    num = int(input(\"Enter number: \"))
except ValueError:
    print(\"Invalid input.\")
else:
    print(\"You entered:\", num)<\/pre>\n\n\n\n
TRY \u2013 EXCEPT \u2013 FINALLY<\/strong><\/h2>\n\n\n\n
The finally<\/code> block runs no matter what.<\/p>\n\n\n\n
try:
    print(10 \/ 2)
except ZeroDivisionError:
    print(\"Error\")
finally:
    print(\"Execution completed.\")<\/pre>\n\n\n\n
COMPLETE STRUCTURE<\/strong><\/h2>\n\n\n\n
try:
    # risky code
except SpecificError:
    # handle specific error
except Exception as e:
    # handle other errors
else:
    # runs if no error
finally:
    # always runs<\/pre>\n\n\n\n
WHY USE TRY & EXCEPT?<\/strong><\/h2>\n\n\n\n
\u2022 Prevents program crashes
\u2022 Makes programs user-friendly
\u2022 Handles unexpected situations
\u2022 Important for file handling, databases, APIs, etc.<\/p>\n\n\n\n
KEY TAKEAWAYS<\/strong><\/h2>\n\n\n\n
\u2022 try<\/code> contains risky code
\u2022 except<\/code> handles errors
\u2022 else<\/code> runs if no error
\u2022 finally<\/code> always runs
\u2022 Handle specific errors when possible<\/p>\n\n\n\n
try<\/code> and except<\/code> are essential for writing safe and professional Python programs.<\/p>\n\n\n
Home<\/a><\/span> \u00bb PYTHON INTERMEDIATE (PYI) > Exception Handling > Try and Except<\/span><\/span><\/div>\n\n\n
<\/strong> 
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