try...except statement in Python is used to handle exceptions or errors that may occur during the execution of a program. It allows you to catch and handle specific exceptions gracefully, preventing your program from crashing and providing a way to handle the error condition.
The basic syntax of the
try...except statement is as follows:
try: # Code that may raise an exception except ExceptionType1: # Code to handle ExceptionType1 except ExceptionType2: # Code to handle ExceptionType2 else: # Code that runs if no exceptions were raised finally: # Code that always runs, regardless of whether an exception was raised or not
Here’s a breakdown of the various parts of the
tryblock contains the code that might raise an exception.
exceptblock(s) define the exception(s) you want to catch and handle. If any of the specified exceptions occur within the
tryblock, the corresponding
exceptblock will be executed. You can have multiple
exceptblocks to handle different exception types.
elseblock is optional and runs if no exceptions were raised in the
tryblock. It is typically used for code that should execute only if no exceptions occurred.
finallyblock is also optional and always runs, regardless of whether an exception occurred or not. It is often used for cleanup operations, such as closing files or releasing resources.
Here’s an example that demonstrates the usage of
try: x = 10 / 0 # This will raise a ZeroDivisionError print("This line will not be executed.") except ZeroDivisionError: print("Cannot divide by zero!") else: print("No exceptions occurred.") finally: print("Finally block always runs, regardless of exceptions.")
In this example, a
ZeroDivisionError exception occurs when trying to divide 10 by 0. The
except ZeroDivisionError block catches the exception and executes the code inside it, printing the error message. Since an exception occurred, the
else block is skipped, and the
finally block is executed, printing the final message.
By using the
try...except statement, you can handle specific exceptions and gracefully handle error conditions in your code, making it more robust and preventing crashes.