Begginers Guide - Exrcise. Help me, plz!
Jeff Shannon
jeff at ccvcorp.com
Fri Mar 22 13:38:22 EST 2002
Jim Dennis wrote:
> Shouldn't all these (helpful) examples be using raw_input() rather
> than input(). Do we really want the new user to be implicitly and
> blindly using eval(raw_input())?
Yes, they should. :) The calls to input() should, in this case, all be
replaced by int(raw_input()), and optionally wrapped in a try/except and while
loop, so that the program can prompt again if a non-numeric value is given. I
almost mentioned this in my earlier response, but decided not to overly confuse
the O.P. -- this essentially doubles the code size.
while sum < sum_stop:
num = None
while num is None:
try:
num = int(raw_input("Please enter the number:"))
except ValueError:
print "That's not a number. Try again!"
sum = sum + num # could also be sum += num
print "The sum is", sum
print "and it is > 100"
Alternatively, instead of setting num to None and watching for that to change,
we could use a 'while 1: try: ... except: ... else: break' structure.
Jeff Shannon
Technician/Programmer
Credit International
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