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Python custom exception error message

class CarError( Exception) : " " " Basic exception for errors raised by cars" " " def _ _ init_ _ ( self, car, msg= None) : if msg is None: # Set some default useful error. It' s also possible to encapsulate the original exception into a custom defined exception, as done above. In this article, you will learn to define custom exceptions depending upon your requirements. Python Custom Exceptions. This new exception can be raised, like other exceptions, using the raise statement with an optional error message. Here' s a quick example of a custom Exception class with special codes: class ErrorWithCode( Exception) : def _ _ init_ _ ( self, code) : self. code = code def _ _ str_ _ ( self) : return repr( self. code) try: raise ErrorWithCode( 1000) except. This tutorial will go through the " what" and " why" of exceptions in Python, and then walk you through the. A traceback message gives some information about the actual error and gives some detail about how we got to the. Exception classes are just normal classes, so you can define your own _ _ init_ _ that calls super appropriately:. If you do want to use error codes, you might want to consider using an Enum, or maybe one of the fancier enum types on PyPI. Use a try- except block to capture the error and use the raise statement to say the error message of your choice: try: a = int( input( ) ) except: raise Exception( ' There has been an error in the system' ). class ValidationError( Exception) : def _ _ init_ _ ( self, message, errors) : # Call the base class constructor with the parameters it needs super( ValidationError, self).

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    Message custom error

    _ _ init_ _ ( message) # Now for your custom code. Errors detected during execution are called exceptions and are not unconditionally fatal: you will soon learn how to handle them in Python programs. Most exceptions are not handled by programs, however, and result in error messages as. x where x> = 6: try: try: raise ValueError # something bad. except ValueError as err: err. message+ " hello" raise # re- raise current exception except ValueError as e: print( " got error of type " +. class HumiditiesError( Exception) : pass def set_ humidities( humidities) : if humidities is None: raise HumiditiesError( ' Value required' ) try: set_ humidities( None) except HumiditiesError as e: print ' Humidities error: ', e.