将多个列表写入CSV

Question

I have two lists:

x = [['a','b','c'], ['d','e','f'], ['g','h','i']]
y = [['j','k','l'], ['m','n','o'], ['p','q','r']]

I'd like to write lists x and y to a CSV file such that it reads in columns:

Col 1:
a
b
c

Col 2:
j
k
l

Col 3:
d
e
f

Col 4:
m
n
o

etc. I'm not really sure how to do this.

Answer 1

You can use zip to do the transpose and csv to create your output file, eg:

x = [['a','b','c'], ['d','e','f'], ['g','h','i']]
y = [['j','k','l'], ['m','n','o'], ['p','q','r']]

from itertools import chain
import csv
res = zip(*list(chain.from_iterable(zip(x, y))))
with open(r'yourfile.csv', 'wb') as fout:
    csvout = csv.writer(fout)
    csvout.writerows(res)

If you have unequal lengths, then you may wish to look at itertools.izip_longest and specify a suitable fillvalue= instead of using the builtin zip