load a certain number of rows from csv with numpy

Question

I have a very long file and I only need parts, a slice, of it. There is new data coming in so the file will potentially get longer.

To load the data from the CSV I u

Answer 1

Following this example, you should be able to use itertools.islice, without needing imap, map or csv.reader:

import numpy as np
import itertools

with open('sample.txt') as f:
    # this will skip 100 lines, then read the next 50
    d=np.genfromtxt(itertools.islice(f,100,150),delimiter=',',usecols={cols})