Hello there, Thank you for the prompt response.
On 12/23/05, bob <[EMAIL PROTECTED]> wrote: > At 10:15 AM 12/23/2005, Panagiotis Atmatzidis wrote: > >Hello, > > > >Can someone provide me with an error checking example about an x > >variable that needs to be number only? I used something like: > > > > def useridf(): > > print "" > > print "WARNING: If you don't understand why this must be unique, > >exit and read the manual." > > You ask the user to exit but you don't tell him how to do that! > > > print "" > > userid = input("x : ") > > > >I know that "input" accepts only numbers > > How did you "know" that? Try this: > print input("x ; ") > and enter "Hello world" OSX atma ~ $ python Python 2.3.5 (#1, Mar 20 2005, 20:38:20) [GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> x = input("x: ") x: hello world Traceback (most recent call last): File "<stdin>", line 1, in ? File "<string>", line 1 hello world ^ SyntaxError: unexpected EOF while parsing Just did.. and as you can see I get an error. I know because I read so in the tutorial I mentioned before.. I mean that it says so.. now I am taking the first steps into programming, hence I don't really know if there's another reason for input to break upon chars. >>> x = input("x: ") x: 12 >>> > > Truth is input() "accepts" anything and attempts to evaluate it as a > Python expression. If that fails it raises an exception. Okay. > > You should use raw_input() instead. This takes any input and returns > it as a character string. I already use raw_input for alphanumeric characters. > x = raw_input("x : ") > if x.isdigit(): # ensure input is a number > y = int(x) # convert to integer > else: > print 'Boo" Thank you for the sample code. > > >, but I don't want the program > >to break if someone puts other chars in it. I want to, print "Only > >numbers are accepted." which is easy. But still I can't understand how > >to do the check using if/elif/else statements. > > Best Regards, Panagiotis _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor