[Tutor] 'source' in python or preloading variables

[John]

Ok, so trying to convert it to a function:

def source(ifile, *args):
        """ takes a file object and a list of variables as input.
            assumes, source file has variables in format:
            VAR[i]=variable """

        import re
        # Read the file
        lines = fd.readlines()
        fd.close()

        # Make it python friendly: put all values in 'single quotes'
        cmd = '\n'.join([re.sub( r'^([^=]+)=(.*)$', r"\1='\2'", v) for v in
lines])

        # Create variables as list of appropriate size with default
IM STUCK HERE... HOW DO I DYNAMICALLY CONVERT THE LIST OF VARIABLE NAMES TO
VARIABLES OF TYPE LIST

        # Execute the command and all your variables are populated ...
        exec(cmd)


Thanks,





> Thanks! This is helpful.. I like the RE approach as it's conceivable to
> write a function...
>
> On 10/27/07, Aditya Lal <aditya.n.lal at gmail.com> wrote:
> >
> > You can source the file in python provided that you make it python
> > friendly:-
> >
> > STN_id[1]='AAA' instead of STN_id[1]=AAA
> > ...
> >
> >
> > -----------
> > import re
> > # Read the file
> > fd = open('sitelocations')
> > lines = fd.readlines()
> > fd.close()
> >
> >
> > # Make it python friendly: put all values in 'single quotes'
> > cmd = '\n'.join([re.sub( r'^([^=]+)=(.*)$', r"\1='\2'", v) for v in
> > lines])
> >
> >
> > # Create variables as list of appropriate size with default values
> > (assuming 0)
> > max = 5
> > STN_id, STNlat, STNlon, STNelv = [0]*max, [0]*max, [0]*max, [0]*max
> >
> >
> > # Execute the command and all your variables are populated ...
> > exec(cmd)
> >
> >
> > -------------------
> > Not sure if this is a better way :) But atleast it will make the file
> > sitelocations order invariant - implies you can interchange the lines
> > without breaking the logic.
> >
> >
> > Caveat - list in python starts at 0 index so STN_id[1] is not the first
> > element but the second element. But you can filter unwanted items from the
> > list if you want as in -
> > [ x for x in STN_id if x != 0 ]
> >
> >
> > HTH
> > Aditya
> >
> >  On 10/27/07, John < washakie at gmail.com> wrote:
> >
> > >  I have a file sitelocations:
> > >
> > > STN_id[1]=AAA
> > > STNlat[1]=58.800000
> > > STNlon[1]=17.400000
> > > STNelv[1]=20
> > > STN_id[2]=BBB
> > > STNlat[2]=42.450000
> > > STNlon[2]=25.583333
> > > STNelv[2]=2925
> > >
> > > which in shell scripts I can simple 'source'. In Python I have to:
> > > sitesFile=file('sitelocations','r')
> > > sites=sitesFile.readlines()
> > > i=0;
> > > for l in sites:
> > >         if i==0:
> > >                 STN_id.append(l.split('=')[1].strip('\n')); i+=1;
> > >         elif i==1:
> > >                 STNlat.append(l.split('=')[1].strip('\n')); i+=1;
> > >         elif i==2:
> > >                 STNlon.append(l.split('=')[1].strip('\n')); i+=1;
> > >         else:
> > >                 STNelv.append(l.split('=')[1].strip('\n')); i=0;
> > >
> > > Is there a better way??
> > >
> > > Thanks!
> > >
> > >
> > >
> > >
> > > --
> > > Configuration
> > > ``````````````````````````
> > > Plone 2.5.3-final,
> > > CMF-1.6.4,
> > > Zope (Zope 2.9.7-final, python 2.4.4, linux2),
> > > Five 1.4.1,
> > > Python 2.4.4 (#1, Jul 3 2007, 22:58:17) [GCC 4.1.1 20070105 (Red Hat
> > > 4.1.1-51)],
> > > PIL 1.1.6
> > >
> > > _______________________________________________
> > > Tutor maillist  -   Tutor at python.org
> > > http://mail.python.org/mailman<http://mail.python.org/mailman/listinfo/tutor>/listinfo/tutor<http://mail.python.org/mailman/listinfo/tutor>
> > >
> > >
> >
> >
> > --
> > Aditya
> >
>
>
>
> --
> Configuration
> ``````````````````````````
> Plone 2.5.3-final,
> CMF-1.6.4 ,
> Zope (Zope 2.9.7-final, python 2.4.4, linux2),
> Five 1.4.1,
> Python 2.4.4 (#1, Jul 3 2007, 22:58:17) [GCC 4.1.1 20070105 (Red Hat
> 4.1.1-51)],
> PIL 1.1.6
>



-- 
Configuration
``````````````````````````
Plone 2.5.3-final,
CMF-1.6.4,
Zope (Zope 2.9.7-final, python 2.4.4, linux2),
Five 1.4.1,
Python 2.4.4 (#1, Jul 3 2007, 22:58:17) [GCC 4.1.1 20070105 (Red Hat
4.1.1-51)],
PIL 1.1.6
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