# File: except7.py
# Program to read in a positive number
# and complain when the input isn't that
#
# Matt Bishop, MHI 289I, Winter 2018

# read in a positive number
# raise a ValueError if input is not positive
#
def getposnumber():

    # 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
    n = int(raw_input("type a number: "))

    # okay, it's an int -- if it's a nonpositive one, complain
    if n < 0:
        raise ValueError, "You entered a negative number"
    elif n == 0:
        raise ValueError, "You entered 0"

    # now just return it
    return n

#
# loop to show exception handling
#    
while True:

    # read in a positive integer
    # handle any exceptions (relatively) intelligently
    try:
        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 n <= 0:
            print "You typed a non-positive number"
        else:
            print "Read", n
    finally:
        print "\n-----------------------\n"