More efficient way to convert a nested list to .cs

Question

I've a nested list like Python_List below and I want to make a .csv like below:

    Python_List|->  .csv
    [['2','4'],|     2,4   
     ['6','7'],|     6,7
     ['5','9'],|     5,9
     ['4','7']]|     4,7

So far I'm using this code:

Python_List=[['2','4'],  ['6','7'], ['5','9'], ['4','7']]
with open('test.csv','w') as f:
    for i in range(0,len(Python_List)):
        f.write('%s,%s\n' %(Python_List[i][0],Python_List[i][1]))

Are there any alternatives more efficient?

Answer 1

You can csv module and its writer method, like this

pyList = [['2','4'],  ['6','7'], ['5','9'], ['4','7']]
import csv
with open('Output.txt', 'wb') as csvfile:
    csvwriter = csv.writer(csvfile, delimiter=',')
    map(csvwriter.writerow, pyList)

Answer 2

Consider using the writer method of the csv module.

It may not be more efficient but it will be easier to understand.

For Example

import csv
with open('test.csv', 'w') as csvfile:
    csvwriter = csv.writer(csvfile, delimiter=',')
    csvwriter.writerows(Python_List)

Answer 3

>>> i = [['2','4'],  ['6','7'], ['5','9'], ['4','7']]
>>> with open('test.csv','w') as f:
...    writer = csv.writer(f)
...    writer.writerows(i)
... 
>>> quit()
$ cat test.csv
2,4
6,7
5,9
4,7