Python Errors and Exceptions

In Python, errors and exceptions are used to indicate that something has gone wrong while a program is running. Errors and exceptions can be handled in Python using try-except blocks, which allow the program to continue executing even if an error or exception occurs.

In Python, here’s an example of how to use a try-except block to handle an error:

Try:

    x = 1 / 0

except ZeroDivisionError:

    print("Division by zero is not allowed")

In this example, the try block contains a statement that will raise a ZeroDivisionError if the divisor is zero. The except block will catch the error and print a message indicating that division by zero is not allowed.

You can also specify multiple except blocks to handle different types of errors or exceptions. For example:

try:

    x = int("abc")

except ValueError:

    print("Invalid input")

except TypeError:

    print("Invalid type")

In this example, the try block contains a statement that will raise a ValueError if the input string cannot be converted to an integer, and a TypeError if the input is not a string. The first except block will catch the ValueError and print a message indicating that the input is invalid, and the second except block will catch the TypeError and print a message indicating that the input has the wrong type.

You can also use the finally keyword to specify a block of code that should always be executed, regardless of whether an error or exception occurs. For example:

try:

    x = 1 / 0

except ZeroDivisionError:

    print("Division by zero is not allowed")

Finally:

    print("This will always be printed")

In this example, the finally block will be executed after the except block, regardless of whether a ZeroDivisionError occurred or not.

Errors and exceptions in Python can be useful for indicating that something has gone wrong while a program is running, and the try-except-finally blocks allow you to handle them in a structured way and continue executing the program.

An exception is an error that occurs during programme execution. Non-programmers define exceptions as cases that do not follow a general rule. In computer science, the term “exception” has the same meaning: It means that the problem (the exception) doesn’t occur frequently, i.e. the exception is the “exception to the rule”. Exception handling is a concept used in various programming languages to automatically handle or deal with errors. Exception handling is built into several programming languages, including C++, Objective-C, PHP, Java, Ruby, Python, and many others.

Errors are often handled by preserving the state of execution at the time the error occurred and stopping the program’s normal flow to execute a specific function or piece of code known as the exception handler. Depending on the type of issue (“division by zero,” “file open error,” and so on), the error handler can “repair” the problem and the application can be resumed with the previously recorded data.

Don’t miss out on the detailed story: Python Errors and Exceptions