[Tutor] Converting a string into dictionary references

[Gerhardus Geldenhuis]

Not quite,

I have csvfile1:
column1, column2, column3, ... column200

That is my raw data but I want to use only 5 columns for example in a
specific application.
I thus want a file with the following:
column33,column1,column5

I then want to read the original csv file and write a new csv file with the
requested columns only.

Does that make more sense?

Regards

On 23 April 2012 14:41, Joel Goldstick <joel.goldstick at gmail.com> wrote:

> On Mon, Apr 23, 2012 at 8:56 AM, Gerhardus Geldenhuis
> <gerhardus.geldenhuis at gmail.com> wrote:
> > Hi
> > Appologies about the subject I could not think of a better description.
> >
> > I have this very simple function:
> >
> > def readcsvfile(filename):
> >   f = open(filename, 'ro')
> >   csvdata = csv.DictReader(f)
> >   for row in csvdata:
> >     print row["column3"]+','+row["column1"]
> >
> > I have another inputfile that will be comma separated list of values.
> > Eg:
> > column3,column4,column10
> >
> > The idea is that I use this inputfile to tranform the original csv file.
> I
> > thus want a new file with only the specified columns. I am sure there is
> an
> > elegant way of doing this but I am not sure how to convert my print
> > statement into something more dynamic. Any pointers would be appreciated.
> >
> > Regards
> >
> > --
> > Gerhardus Geldenhuis
> >
> > _______________________________________________
> > Tutor maillist  -  Tutor at python.org
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> >
>
> So you want to take 'column1' and get back 1?, 'column10' and get back 10?
>
> s = 'column1'
> i = int(s[6:])
>
> This will only work if your strings all start with the text 'column'
>
> --
> Joel Goldstick
>



-- 
Gerhardus Geldenhuis
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