[Tutor] PYTHON QUOTES ISSUE

[Susana Iraiis Delgado Rodriguez]

Hello taserian and Antonio!

Thank you both for taking the time to answer my question. With taserian's
code it gives me the next output:
C... ogr2ogr T21-PUENTESshp -where "LAYER=T21-PUENTES"
tapalpa_05_plani_line.shp
but the output I need is:
C... ogr2ogr T21-PUENTESshp -where "LAYER=' T21-PUENTES' "
tapalpa_05_plani_line.shp

I did the Antonio's suggested corrections, and I got the string I wanted,
now the problem is that my subprocess doesn't work properly, I'll give a
look and see whats wrong with it.


2010/10/7 taserian <taserian at gmail.com>

>  On Thu, Oct 7, 2010 at 12:48 PM, taserian <taserian at gmail.com> wrote:
>
>> 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 + "'\""
>>
>
> Begin corrections (corrections start with a *)
>
>   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=
>>
> *Single Quote (2) to be included in the literal (which doesn't need to be
> escaped): '
>
>>  Close Quote: "
>>
>  Add the content of the variable "line" from the unico.txt file:  + line +
>>
> *Add another literal, composed of the single quote that closes (2) above,
> then the closing escaped quote to close (1) : "'\""
>
>
>>
>> See if this works, and let us know how it turns out.
>>
>> Antonio Rodriguez
>>
>
> End of corrections.
>
> Antonio Rodriguez
>
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