Hi,
I tried to load data from a csv file into numpy using genfromtxt. I need
only a subset of the columns and want to apply some conversions to the
data. attached is a minimal script showing the error.
In brief, I want to load columns 1,2 and 4. But in the converter
function for the 4th column, I get the 3rd value. The issue does not
occur if I also load the 3rd column.
Did I somehow misunderstand how the function is supposed to work or is
this indeed a bug?
I'm using python 3.3.1 with numpy 1.8.1
Regards
Adrian
import numpy
import io
off1, off2 = 0, 4000
dtype = [('EntryNr1','i4'),('EntryNr2','i4'),('RelType', 'i1')]
fn = io.BytesIO("""1,5,-1,1:1,1.98\n2,8,-1,1:n,22.56\n3,3,-2,m:n,18.2\n""".encode('utf-8'))
relEnum = {'1:1':0, '1:n':1, 'm:1':2, 'm:n':3}
data = numpy.genfromtxt(fn, dtype=dtype,
delimiter=',',
usecols=(0,1,3),
converters={0: lambda nr: int(nr)+off1,
1: lambda nr: int(nr)+off2,
3: lambda rel: relEnum[rel.decode()]})
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