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kelsang sherab
749 PointsIn 3:19 it says err is a new variable. How come?
In 3:19 Craig says that err is a new variable created and assigned the value "More than 1 person etc ..." how does it know where to take its assigned value?
3 Answers
Alexander Davison
65,469 Pointserr is assigned to the error's message.
Back in the split_check function, Craig raises an error with the message "More than 1 person is required to split the check". In the except block, Craig is catching that error and extracting the message out of the error. The except ValueError as err tells Python to catch any ValueErrors and put its error message in a new variable called err.
Chris Freeman
Treehouse Moderator 68,457 PointsGreat question!
In the try documentation:
When a matching except clause is found, the exception is assigned to the target specified after the as keyword in that except clause, if present, and the except clause’s suite is executed.
The identifier, err in this case, will hold the exception object so that it can be referenced from within the except clause's suite (code block).
Post back if you need more details. Good Luck!!
kelsang sherab
749 PointsThanks all. As a beginner I find it all a little bit much to digest quickly. I feel I need to spend time with the code and your answers.
Thanks for helping!!
Dave StSomeWhere
19,870 PointsDave StSomeWhere
19,870 PointsMore info here Python Exceptions Handling
Check the "Argument of an Exception" section
Beginning of the text: An exception can have an argument, which is a value that gives additional information about the problem. The contents of the argument vary by exception. You capture an exception's argument by supplying a variable in the except clause as follows −