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An exception is an error that occurs during the execution of a program. When an exception occurs, the program will stop running and an exception object is created. You can handle exceptions in your code using a try-except block.

Here’s an example of how to handle a ZeroDivisionError exception, which is raised when you try to divide by zero:

try:
    x = 1 / 0
except ZeroDivisionError:
    print("You cannot divide by zero!")

You can also handle multiple exceptions in the same try-except block using a tuple:

try:
    x = 1 / 0
    y = 'a' + 1
except (ZeroDivisionError, TypeError):
    print("A division by zero or a type error occurred.")

You can raise an exception in your code using the raise keyword. For example:

raise ValueError("Invalid input")

You can also define your own custom exceptions by creating a new class that inherits from the Exception class.

class MyCustomException(Exception):
    pass

raise MyCustomException("An error occurred")