Demonstrating a programmer-defined exception class. : Error Exception « Statement « Python Tutorial

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Python Tutorial » Statement » Error Exception 
3. 9. 12. Demonstrating a programmer-defined exception class.
import math

class NegativeNumberErrorArithmeticError ):
   """Attempted improper operation on negative number."""
   pass

def squareRootnumber ):
   """Computes square root of number. Raises NegativeNumberError
   if number is less than 0."""

   if number < 0:
      raise NegativeNumberError, "Square root of negative number not permitted"

   return math.sqrtnumber )

while 1:
   try:
      userValue = floatraw_input"\nPlease enter a number: " ) )
      print squareRootuserValue )
   except ValueError:
      print "The entered value is not a number"
   except NegativeNumberError, exception:
      print exception
   else:
      break
3. 9. Error Exception
3. 9. 1. Catching Exceptions with try..except
3. 9. 2. ZeroDivisionError: division by any numeric zero
3. 9. 3. IndexError: request for an out-of-range index for sequence
3. 9. 4. KeyError: request for a non-existent dictionary key
3. 9. 5. AssertionError
3. 9. 6. IOError: input/output error
3. 9. 7. AttributeError: attempt to access an unknown object attribute
3. 9. 8. try-except Statement
3. 9. 9. try Statement with Multiple excepts
3. 9. 10. except Statement with Multiple Exceptions
3. 9. 11. replace our single error string with the string representation of the exception argument.
3. 9. 12. Demonstrating a programmer-defined exception class.
3. 9. 13. Exceptions Can Be Classes
3. 9. 14. Exception Classes
3. 9. 15. String-Based Exceptions
3. 9. 16. Working with the Exception Information
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