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From: "Prasad, Ramit" <ramit.prasad@jpmorgan.com>
To: CTSB01 <scott.moore270@gmail.com>, "python-list@python.org" <python-list@python.org>
Subject: RE: Creating a Simple User Interface for a Function
Thread-Topic: Creating a Simple User Interface for a Function
Thread-Index: AQHOiXm5lj0RxhF6Pkao9ZY86wWzvpl15VxQ
Date: Fri, 26 Jul 2013 14:08:14 +0000
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CTSB01 wrote:
> On Thursday, July 25, 2013 3:19:27 PM UTC-4, Dave Angel wrote:
> > On 07/25/2013 12:03 PM, CTSB01 wrote:
> >
> > > I have the following code that runs perfectly:
> >
> >
> > >       def psi_j(x, j):
> >
> > >            rtn =3D []
> >
> > >            for n2 in range(0, len(x) * j - 2):
> >
> > >              n =3D n2 / j
> >
> > >              r =3D n2 - n * j
> >
> > >              rtn.append(j * x[n] + r * (x[n + 1] - x[n]))
> >
> > >              print 'n2 =3D', n2, ': n =3D', n, ' r =3D' , r, ' rtn =3D=
', rtn
> >
> > >            return rtn
> >
> > No it doesn't run perfectly.  It'll get a syntax error on the print
> >
> > function call.  That's assuming you're still using Python 3.3.  You
> >
> > really need to start by specifying your environment, without making us
> >
> > look back through previous threads from you.
> >
> > > This code takes a string x =3D [0,1,1,1,2] for example
> >
> > That's not a string.  A string would be like
> >
> >     xx =3D psi_j("0abcd1234")
> >
> > Perhaps you mean list?  And is it a list of integers, or of arbitrary
> >
> > numbers?  Are there any constraints on the sizes or signs of those numbe=
rs?
> >
> > > (it must always begin with 0) and a parameter j, say 2, and outputs a=
 string (x =3D [0, 1, 2, 2, 2,
> 2, 2, 3] in this example).
> >
> > > It does this in two steps: First it decomposes some number m into a mu=
ltiple of j and a remainder.
> >
> > Only if you replace the / with //.  Or just use the function divmod():
> >
> >        n, r =3D divmod(n2, m)
> >
> > >  Then it runs this decomposition through a function on the rtn.append=
 line.
> >
> > > Notice that this has cj - 1 terms where c is the number of terms in th=
e input string and j is the
> parameter.  Normally, we would like it to be able to calculate cj terms.
> >
> > > This is an issue with the function that I am more than happy to put as=
ide for the moment.
> >
> > > My key interest is to be able to make this program
> >
> > So far you have a function, not a program.  If you put it in a text file
> >
> > and run it from python, it'll do nothing but display a syntax error
> >
> > message.  And when you fix that, it'll just run without doing anything.
> >
> >   usable for someone who has no knowledge of programming.  In
> >
> > particular, I need some kind of user interface that prompts
> >
> > > the user to input a string (ideally just by putting in numbers in the=
 form 011123334 for example)
> and a parameter,
> >
> > > and then displays the output sequence.  This is essentially what the p=
rogram already does but the
> idea is to make it usable
> >
> > > for even the most technologically disinclined.  Ideally it would do th=
is without needing to run
> Python at all.
> >
> > Then why are you asking on the Python forum?  Or perhaps you mean
> >
> > without him knowing he's running Python?  In that case, use a shebang
> >
> > line at the beginning, which will tell Linux to automatically invoke the
> >
> > specified program (or programming language in this case).
> >
> > >  If anyone is able to make this happen in Python I would be eternally=
 grateful.
> >
> > If we assume you're running Python 3.3 on Linux, and the user is willing
> >
> > to us the terminal, then how about parsing the string from the command
> >
> > line he types?  You can access it as011123334 a string from sys.argv,
> >
> > and convert it to separate numbers.  Of course as it stands now, you
> >
> > cannot tell whether the user wanted
> >
> >    0,1,1,1,2,3,3,3,4
> >
> > or
> >
> >    0, 111, 23, 3, 3, 4
> >
> > or something else.
> >
> > DaveA
> 
> Sorry Dave, to answer each part of your response:
> 
> 1) I decided to use Python 2.7, and I will be sure to specify this in all=
 future threads.
> 2) It is a list of positive integers.  In fact, it is always going to be a=
 list of positive increasing
> integers.
> 3) You're right.  What I meant was that if after running that bit of code=
 I enter
> >>> x =3D [0,1,2,3,4,5]
> >>> psi_j(x,2)
> I will get output that matches my requirements.
> 4) Yes, sorry that's what I meant (if I understood correctly).  I was told=
 elsewhere that I might want
> to try using tkinter.  Essentially I'm trying to create a user interface t=
hat allows the user to just
> type in a string 01112345 for example, and choose a parameter (say j=3D2)=
 and then click a button to run
> the function.  I'd like to be able to run send a .exe file that the user c=
an just open up and use with
> no further setup.

Any UI will work whether graphical or command line. TK is a good choice if y=
ou assume that the user
has Python installed. If you are planning to create an exe (Windows) then yo=
u can probably
bundle any GUI library (wx/gtk/qt) but you might be limited by the support o=
f the exe creating
tool. I have never created an executable like this, so I am not sure. 

> 
> So on top of the user interface I would also it looks like need to determi=
ne how to make Python change
> a string 01112345 into a list so that it does that automatically when the=
 user clicks 'run'.

This really does not make sense to me. Does that mean 0, 1, 11, 23, 45 or 0,=
 111, 2345 or 0,11, 
2345 or something else entirely? If you are doing this on the shell I would=
 have the user pass 
in a string of delimited values. "0,1,11,23,45" and then do a .split(',') on=
 the string. If 
you are doing this via GUI then you can create separate fields for each numb=
er or still ask 
for a delimited string.

However, if the parameter (j=3D2) determines parsing of numbers then you can=
 ignore my concerns.

> 
> Would a shebang still be the right way to go?

The shebang is useful when executing a script from cmd/shell directly.

$ ./script.py 
# rather than 
$ python script.py

If you are making an executable (.exe in Windows) then I do not
think it will matter either way for 2.7.

> 
> Thanks again Dave, apologies for the ambiguity.


~Ramit



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