Then, if its type matches the exception named after theĮxcept keyword, the except clause is executed, and then execution If an exception occurs during execution of the try clause, the rest of theĬlause is skipped. If no exception occurs, the except clause is skipped and execution of the įirst, the try clause (the statement(s) between the try and x = int ( input ( "Please enter a number: " )). Is signalled by raising the KeyboardInterrupt exception. Whatever the operating system supports) note that a user-generated interruption Look at theįollowing example, which asks the user for input until a valid integer has beenĮntered, but allows the user to interrupt the program (using Control- C or It is possible to write programs that handle selected exceptions. Traceback listing source lines however, it will not display lines read fromīuilt-in Exceptions lists the built-in exceptions and their meanings. Occurred, in the form of a stack traceback. The preceding part of the error message shows the context where the exception The rest of the line provides detail based on the type of exception and what StandardĮxception names are built-in identifiers (not reserved keywords). This is true for all built-in exceptions, but need not be trueįor user-defined exceptions (although it is a useful convention). The string printed as the exception type is the name of the built-in exception The example are ZeroDivisionError, NameError and TypeError. Exceptions come inĭifferent types, and the type is printed as part of the message: the types in
The last line of the error message indicates what happened. 10 * ( 1 / 0 ) Traceback (most recent call last):įile "", line 1, in ZeroDivisionError: division by zero > 4 + spam * 3 Traceback (most recent call last):įile "", line 1, in NameError: name 'spam' is not defined > '2' + 2 Traceback (most recent call last):įile "", line 1, in TypeError: can only concatenate str (not "int") to str
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