Raising an Exception

In Python, the raise statement is used to explicitly raise an exception. It allows you to generate a specific exception and provide additional information about the error.

The basic syntax of the raise statement is as follows:

raise <ExceptionType>("Optional error message")

Example: Raise an error and stop the program if x is lower than 0

x = -1  
  
if x < 0:  
  raise Exception("Sorry, no numbers below zero")

You can also define what kind of error to raise, and the text to print to the user:

Example: Raise a TypeError if x is not an integer

x = "hello"  
  
if not type(x) is int:  
  raise TypeError("Only integers are allowed")