Dear Alassane,
Please keep conversations on the list.
On 29/08/16 19:49, alassane toure wrote:
Dear Moritz,
I am a newbi in python programming. Following your instructions i added
the followings..
par_sqf=[]
c_number=[]
pchng=[]
but pchng stayed NULL for all rows (see below)!
You set pchng = range(len(par_sqf)),
but par_sqf is only defined as a Python variable by
par_sqf=[]
so it is normal that it is NULL.
Don't mix up Python variables and vector map column names.
If you want to set the attribute column pchng to contain a value that is
equal to the length of the value of the attribute column par_sqf (i.e.
count the number of digits (plus decimal point) in the area value), then
you have to use v.db.update:
v.db.update map=parcel column=pchng qcol="length(par_sqf)"
Although I don't understand what the sens of such a length would be.
Maybe it would be easier if you explained us what you are trying to do,
instead of only how you are doing it.
Moritz
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