i have CSV file as the following:

aa , a1, 1, bb, b1, 11, cc, c1, 111
aa2 , a2, 2, bb2, b2, 22, cc2, c2, 222
aa3 , a3, 3, bb3, b3, 33, cc3, c3, 333

and I need to take the first three content and store it in array like: aa , a1, 1, bb, b1, 11, cc, c1, 111 will become into ['aa a1 1', 'bb b1 11', 'cc c1 111']

and this my code:

import csv

with open('Test.csv') as csv_file:
    csv_reader = csv.reader(csv_file)
    rows = list(csv_reader)
    lines= len(list(rows))

    for line in range(lines):
        i=0
        j=1
        k=2

        for l in range(len(list(rows[line]))):
            t=[]
            t.append(rows[line][i] rows[line][j] rows[line][k])
            print(t[0:])
            i =3
            j =3
            k =3

CodePudding user response：

With for-loops, it is usually preferable to iterate on the items directly, using for instance for row in rows:, rather than on the indices, using for instance for line in range(lines):.

Also, note that every time you call list, you are building a new list. This can be wasteful. For instance, lines = len(list(rows)) builds an unnecessary copy of the list rows. You could have simply written nb_lines = len(rows).

Since you want to split your list into chunks of 3, you might be interested in reading these:

• Question: How do you split a list into evenly-sized chunks?;
• Documentation for more_itertools.chunked;
• Itertools recipe: "Collect data into fixed-length chunks or blocks".

import csv

t = []
with open('Test.csv') as csv_file:
    for row in csv.reader(csv_file):
        t.append([' '.join(row[i:i 3]) for i in range(3)])
print(t)
# [['aa   a1  1', ' a1  1  bb', ' 1  bb  b1'],
#  ['aa2   a2  2', ' a2  2  bb2', ' 2  bb2  b2'],
#  ['aa3   a3  3', ' a3  3  bb3', ' 3  bb3  b3']]

We can get rid of the bad-looking extra spaces, using str.strip:

import csv

t = []
with open('Test.csv') as csv_file:
    for row in csv.reader(csv_file):
        t.append([' '.join([word.strip() for word in row[i:i 3]]) for i in range(3)])
print(t)
# [['aa a1 1', 'a1 1 bb', '1 bb b1'],
#  ['aa2 a2 2', 'a2 2 bb2', '2 bb2 b2'],
#  ['aa3 a3 3', 'a3 3 bb3', '3 bb3 b3']]