write list columnwise in csv file using python

Question

list1 = [1,2,3]
list2 = [3,5,6]
list3 = [4,5,6]

I want output in csv file as:

A B C 
1 3 4
2 5 5
3 6 6

I tried using pandas as well as np.savetxt() but it doesnt work!

Answer 1

Use DataFrame contructor with to_csv :

pd.DataFrame({'A': list1, 'B': list2, 'C':list3}).to_csv('file.csv', index=False)

If want custom order of columns:

(pd.DataFrame({'A': list1, 'B': list2, 'C':list3}, columns=['B','A','C'])
   .to_csv('file.csv', index=False))

Answer 2

An alternative if you do not want to use external libraries:

import csv
with open('foo.csv', "wb") as csv_file:
        writer = csv.writer(csv_file, delimiter=',')
        writer.writerow(['A', 'B', 'C'])
        for i in range(0, len(list1)):
            writer.writerow([list1[i],list2[i],list3[i]])

Answer 3

尝试这个：

np.savetxt('test.csv', np.c_[l1,l2,l3], delimiter=' ', header='A B C',fmt='%d',comments='')