![]() If you run the code multiple times you can see the different errors being caught by the different except clauses. The output will change based on the specific exception type in each case. Print(f'My Value or Zero Division Error: ') You can use multiple except clauses to handle different exception types differently and/or group exception types together in the same except clause.Įxcept (ValueError, ZeroDivisionError) as e: Multiple Exception Names and Except Clauses ‘ BaseException’ is at the top of the hierarchy and will match any exception type which makes it equivalent to a bare ‘ except:’ and therefore should also be avoided in most cases. So using ‘Exception’ like I used in the example above will catch any exception excluding: You can refer to the built-in exception hierarchy in the Python docs and see that there are ‘parent nodes’ in the hierarchy which will catch any exception type in a child relation with it. PEP8 recommends “Mention specific exceptions whenever possible instead of bare ‘except’ clause.” You can even leave out the name altogether and just write ‘ except:’ followed by your handler but that is considered bad practice (in most cases). The code in the try clause executes as normal, and then it is only stopped at the point that an exception is found.įor example, in the code below, the list items are still printed out until the Inde圎rror exception is reached at i = 3.Įrror: list index out of range Exception Names and HierarchiesĪs you can see in the example above, you don’t need to name the specific exception in order to make the try statement work. Note that the try statement does not ‘look ahead’ at the try clause and then only execute if no error is found. You can see this visualized in the following flow diagram: It is passed to any outer try statements, if no handler is found, it is an unhandled exception and execution of the program stops.If the type of the exception does not match one of the types after except keywords.If the type of the exception that occurred matches (one of) the type(s) after the except keyword(s).If an exception occurs during the execution of the try clause.The program after the try statement is continued. ![]() The finally block executes if there is one. ![]()
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