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Try, except, else and finally
Exceptions example from a Well House Consultants training course
More on Exceptions [link]
Source code: duff Module: Y109
# Try, except, else and finally
""" try - enters at the top and continues through the block except-s - jump to there is an exception is thrown else - run after the try block completes without exception thrown finally - always run after the other blocks have completed """ print "(bfor) Exception demonstration\n" while True: try: n = input("(try-) Please enter a Python value: ") except KeyboardInterrupt: print "(ex/k) You give up?" print "(ex/k) Won't break me that way" except Exception,e: print "(exce) Not acceptable!" print "(exce) Message: ",e print "(exce) Failure Type:",e.__class__.__name__ else: print "(else) Input accepted" break finally: print "(finl) Tidying up\n" print "(done) Value received:",n """ Sample Output trainee@kingston:~/elen/analytics$ python duff (bfor) Exception demonstration (try-) Please enter a Python value: 55 (else) Input accepted (finl) Tidying up (done) Value received: 55 trainee@kingston:~/elen/analytics$ python duff (bfor) Exception demonstration (try-) Please enter a Python value: fiftyfive (exce) Not acceptable! (exce) Message: name 'fiftyfive' is not defined (exce) Failure Type: NameError (finl) Tidying up (try-) Please enter a Python value: 7 / 0 (exce) Not acceptable! (exce) Message: integer division or modulo by zero (exce) Failure Type: ZeroDivisionError (finl) Tidying up (try-) Please enter a Python value: "pasties" (else) Input accepted (finl) Tidying up (done) Value received: pasties trainee@kingston:~/elen/analytics$ python duff (bfor) Exception demonstration (try-) Please enter a Python value: ^C(ex/k) You give up? (ex/k) Won't break me that way (finl) Tidying up (try-) Please enter a Python value: 33 (else) Input accepted (finl) Tidying up (done) Value received: 33 trainee@kingston:~/elen/analytics$ """ Learn about this subject
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