Fredrik Lundh wrote:
> "SeNTry" wrote:
>
>> My first post here as I just begin to learn programming in general and
>> python in particular. I have all the noobie confused questions, but as I
>> work thru the tutorials I'm sure I'll find most my answers.
>>
>> This one is eluding me tho... I am working in the tutorials, writing scripts
>> as presented and then modifying and expanding on my own to try to learn.
>> I'm working with one that asks the user to 'guess a number I'm thinking',
>> and with simple while loop, flow control and operands, returning an answer
>> to guess again or you got it. I've added a 'playagain' function I've got
>> working, but what I want is to stop the program from crashing when someone
>> enters a string value instead of a int value. I know strings are immutable,
>> and they can be changed to an int equivalent, but I just want the script to
>> recognize the input as a string and print a simple "that's not a number, try
>> again' type of message. I can't find the syntax to include in the
>> if/elif/else block to include a line that says something like,
>
> assuming you're using raw_input() to get the guess, you always
> have a string (in python's sense of that word).
>
> what you seem to want is to check if the string contains a number
> or not. here's one way to do this:
>
> guess = raw_input("make a guess: ")
> if guess == secret:
> print "congratulations!"
> elif not guess.isdigit():
> print "that's not a number! please guess again!"
> ...
>
that, or just write something like
guess = raw_input("Make your guess > ")
try:
if int(guess) == secret:
# ok
except ValueError:
# no good
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