[Tutor] PYTHON QUOTES ISSUE

[taserian]

I'm adding some line breaks to make your text a little more readable.

On Thu, Oct 7, 2010 at 9:55 AM, Susana Iraiis Delgado Rodriguez <
susana.delgado_s at utzmg.edu.mx> wrote:

> Hello members:
>
> How can I write a statement to execute the following:
>


> C:/Archivos de programa/FWTools2.4.7/bin/ogr2ogr R1G-GEODESIA.shp -where
> "LAYER = 'R1G-GEODESIA'" tapalpa_05_plani_point.dbf
>


> I want my uotput to look like this.
> Instead I'm getting this
>


> C:/Archivos de programa/FWTools2.4.7/bin/ogr2ogr T21-PUENTES.shp -where
> LAYER=+line tapalpa_05_plani_line.shp
>


> In miy code line is a string given by the user:
>
> for line in open("unico.txt", "r").readlines():
>      p = subprocess.Popen(['C:/Archivos de
> programa/FWTools2.4.7/bin/ogr2ogr', line+'.shp', '-where', "LAYER='line'",
> b+'.shp'])
>
> Any suggestions?
>

Without knowing specifics about what the subprocess.Popen function is
expecting as parameters, I can only speculate, but it seems that the
following *might* work (for extremely generous values of "*might*"):

for line in open("unico.txt", "r").readlines():
     p = subprocess.Popen(['C:/Archivos de
programa/FWTools2.4.7/bin/ogr2ogr', line+'.shp', '-where', "\"LAYER='" +
line + "'\"", b+'.shp'])

Details about where the changes are:
"\"LAYER='" + line + "'\""

Quote to begin the literal: "
An escaped quote (1) so that there's a quote inside the literal: \"
Some of the text that's meant to be unchanging: LAYER="
Close Quote: "
Add the content of the variable "line" from the unico.txt file:  + line +
Add another literal, composed of just the closing escaped quote to close the
quote above (1) : "\""

See if this works, and let us know how it turns out.

Antonio Rodriguez
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