Write every nth line from list to new row in csv file

I have a list that contains numbers like this:

[20.5, 21.7, 23.0, 23.6, 24.0, 24.7]

and i want to write the list to a csv file that should look like this:

20.5, 21.7
23.0, 23.6
24.0, 24.7

so every second line in my list should be written to the next row in the csv file.

right now my script just looks like this:

import csv

with open('result.csv','w') as f:
    for line in my_list:
        f.write("%s\n" % line)

how can i write only every nth line as a new line and every nth line as new row?

>Solution :

If you don’t need the space after the comma:

import csv

data = [20.5, 21.7, 23.0, 23.6, 24.0, 24.7]

with open('result.csv','w') as file:
    csv.writer(file).writerows(data[i:i + 2] for i in range(0, len(data), 2))

Otherwise:

with open('result.csv','w') as file:
    file.writelines(
        ", ".join(map(str, data[i:i + 2])) + "\n" for i in range(0, len(data), 2)
    )