[Tutor] trouble with "if"

adam urbas adamurbas at hotmail.com
Mon May 28 06:42:01 CEST 2007

You don't know what a Ti 83 is.  Calculator.  The most basic programming available.  It already has so many functions built into it that it is much easier to tell it to do things.  You don't have to do all this integer conversion and such whatnot.  Wow... I'm really unsure of how this thing is supposed to work.  It seems the more I learn about Python, the more confused I become.  It's enough to bring tears to your eyes.  Not really but ya.Someone else helped me with the problem of accepting numbers and words.  I used:if shape in["1","circle"]:something like that.  It works wonderfully.  I'm not sure why, but I know that it does and that is enough.  Someone else also said that I had to convert to int, and I did.  That was another problem, which is now fixed.But, as usual, it is just one problem after another.  Now I have run into this error message: Traceback (most recent call last):  File "C:\Documents and Settings\HP_Owner\Python0\area.py", line 23, in <module>    area = 3.14*(radius**2)TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'int'>>> and others like this:Traceback (most recent call last):  File "C:\Documents and Settings\HP_Owner\Python0\area.py", line 19, in <module>    area = height*widthTypeError: can't multiply sequence by non-int of type 'str'>>> Very frustrating.  What is a non-int and what is 'str'?  Why can't it multiply the sequence?  I guess I should include the program I'm using for these things.I'm having this problem with both of these attached.  The messages above are from area.py.  area.py is sort of a prototype of radiacir.py, a test version.  You know, I should probably try that int trick, which I seem to have forgotten.  And guess what that did it.  It's amazing when you apply the things that you learn.  Apparently  I am quite absent minded.  Well It seems I don't need any of this help anymore.  Oh well.  Thanks anyway.Au > To: tutor at python.org> From: alan.gauld at btinternet.com> Date: Thu, 24 May 2007 23:34:05 +0100> Subject: Re: [Tutor] trouble with "if"> > "adam urbas" <adamurbas at hotmail.com> wrote > > >  It won't even accept words.  > > I can only get it to accept numbers.  > > try this(untested code!):> > number = None> data = raw_input('Type something: ')> try: number = int(data)> except: data = data.split()    # assume a string> > if number:    # user entered a number>     if number == 1:  print 'circle'>     elif number == 2: print 'another'> else:         # user entered words>     if data[0].lower() == 'circle': print 'circle'>     else: print 'user entered ', data[0]> > Notice that to use ithe input as a number you have to > convert the raw input characters to a number (using int)> To get the individual words we can use split() which by > default splits a string into the individual words.> > Is that the kind of thing you mean?> > I've no idea what a Ti83 is BTW. :-)> > Alan G.> > _______________________________________________> Tutor maillist  -  Tutor at python.org> http://mail.python.org/mailman/listinfo/tutor
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