[mdlug] Python Code Question

[Gregory Czerniak]

If you really like the interpreter, an alternative strategy would be to
wrap everything in a function first (function definitions are single
commands) and then run that function.  Here's an example:

>>> def main():
...   while True:
...     reply = raw_input('Enter text:')
...     if reply == 'stop': break
...     print int(reply) ** 2
...   print 'Bye'
...
>>> main()
Enter text:2
4
Enter text:5
25
Enter text:stop
Bye
>>>

On Sat, Sep 5, 2015 at 4:04 PM, JeremyBekka C <jrchristophel at gmail.com>
wrote:

> Thanks for your help! It makes sense now when I realise that the
> interpreter cannot run more that one command at a time. When I indent the
> print 'Bye' command under the previous command it works fine. So, the only
> way to be able to run that code in interactive mode is to write it as a
> script and then import it into the interpreter?
>
> Thanks!
>
> On Fri, Sep 4, 2015 at 11:43 PM, Gregory Czerniak <gregczrk at gmail.com>
> wrote:
>
> > Two things:
> > 1) You can python3-ize the above code by treating print as a function
> (wrap
> > the thing to be printed in parentheses) and using input() rather than
> > raw_input().
> > 2) Interactive mode only executes one command at a time.  The "while"
> > statement (and all its indented statements) are one command, and print
> > 'Bye' is another.  The interactive Python interpreter is getting confused
> > by that final print statement since it's not on the same indent level as
> > the other statements in the "while" and it's assuming everything is still
> > related to the "while."
> >
> > On Fri, Sep 4, 2015 at 10:09 PM, JeremyBekka C <jrchristophel at gmail.com>
> > wrote:
> >
> > > Well, I just figured out what was wrong when I ran the code in Idle. I
> > was
> > > using the interpreter for Python3 not 2.7. When I used the right
> > > interpreter it worked fine. However, I can not figure out what is wong
> in
> > > the terminal.
> > >
> > > On Fri, Sep 4, 2015 at 9:56 PM, JeremyBekka C <jrchristophel at gmail.com
> >
> > > wrote:
> > >
> > > > Hello,
> > > >
> > > > I am trying to learn Python by working through the book "Learning
> > Python
> > > > (3th Edition) - Ascher, Lutz (O'Reilly, 2008)". I have a question
> > > regarding
> > > > one of the examples in the book which is using python 2.2. The code
> is
> > > the
> > > > following:
> > > >
> > > > while True:
> > > >     reply = raw_input('Enter text:')
> > > >     if reply == 'stop' : break
> > > >     print int(reply) ** 2
> > > > print 'Bye
> > > >
> > > > When I run this in the Idle interpreter it gives me an error on line
> 4
> > > > with the int() built-in and says "SyntaxError: invalid syntax".
> > > >
> > > > If I run this in the terminal I get the following:
> > > >
> > > > >>> while True:
> > > > ...       reply = raw_input('Enter text:')
> > > > ...       if reply == 'stop' : break
> > > > ...       print int(reply) ** 2
> > > > ...    print 'Bye'
> > > >   File "<stdin>", line 5
> > > >     print 'Bye'
> > > >         ^
> > > > SyntaxError: invalid syntax
> > > >
> > > > Any idea what is wrong here? Iooked up the integer built-in on the
> > python
> > > > website and it did not give me any ideas what is wrong.
> > > >
> > > > Thanks
> > > >
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