Python try

The try keyword in Python is used to define a code block that may raise an exception, allowing errors to be caught and handled gracefully with except, and optionally complemented by else and finally clauses.

Syntax

try:
  # Code that might raise an exception
except ExceptionType:
  # Code to handle the exception
else:
  # (Optional) Code to run if no exceptions occur
finally:
  # (Optional) Code that always runs

In the syntax:

• except (Optional): Specifies the type of exception to catch. Multiple except blocks can handle different exceptions.
• else (Optional): A block that runs only if the try block doesn’t raise an exception.
• finally (Optional): A block that always runs, regardless of whether an exception occurred or not.

Return value:

The try statement itself does not return a value. It controls the flow of execution by handling exceptions within its block.

Example: Handling Division Error with try-except

This example shows how to catch a ZeroDivisionError using a simple try-except block:

try:
  x = 10 / 0
except ZeroDivisionError:
  print("Cannot divide by zero.")

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The output of this code will be:

Cannot divide by zero.

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Codebyte Example: Handling Multiple Exceptions with try-except-finally

This codebyte example captures both invalid input and division-by-zero errors while ensuring a final message always prints:

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Note: Change the value entered for number to see different results and exception handling in action.