Python raise Keyword
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")
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Definition and Usage
The raise keyword is used to raise an 
exception.
You can define what kind of error to raise, and the text to print to the user.
More Examples
Example
Raise a TypeError if x is not an integer:
    x = "hello"
if not type(x) is int:
  raise TypeError("Only 
    integers are allowed")
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