How to loop through specific range of rows with Python csv reader?

Question

How to loop through a specific range of rows with Python csv reader?

The following code loops through all rows:

with open(trainFile, \'rt\') as csvfi         


        

Answer 1

You can use itertools.islice:

import itertools

i, j = 10, 20
with open(trainFile, 'rt') as csvfile:
    spamreader = csv.reader(csvfile, delimiter=' ', quotechar='|')
    for row in itertools.islice(spamreader, i, j+1):
        print (', '.join(row))

Alternative (following code is possible because csv.reader accept an iterable):

NOTE: only works when CSV rows do not contain newline.

import itertools

i, j = 10, 20
with open(trainFile, 'rt') as csvfile:
    spamreader = csv.reader(itertools.islice(csvfile, i, j+1),
                            delimiter=' ', quotechar='|')
    for row in spamreader:
        print (', '.join(row))