# File: except7.py # Program to read in a positive number # and complain when the input isn't that # # Matt Bishop, MHI 289I, Fall 2022 # True if error encountered when something read; # False otherwise err = False # read in a positive number # def getposnumber(): global err # read the input and convert it to an integer # notice we do *not* catch the error here; it # is to be caught by the caller try: n = int(input("type a number: ")) except ValueError: print("ValueError in getposnumber()") n = 0 err = True # now just return it return n # # the program itself # def main(): global err # # loop to show exception handling # while True: # read in a positive integer # handle any exceptions (relatively) intelligently try: err = False n = getposnumber() # exception: bad value (string, invalid number) except ValueError as msg: print(msg, "-- try again!") # give it another chance # exception: end of file except EOFError as msg: print(msg, "-- bye!") # quit break # some other exception except: print("Unknown exception -- ignoring!") # ignore the problem # no exception -- print the number else: if err == True: pass elif n <= 0: print("You typed a non-positive number") else: print("Read", n) finally: print("\n-----------------------\n") main()