Write a list of lists to a CSV file...
chars = 'abcdefghij'
matrix = [[x for x in chars.lower()], [i for i in range(10)],
[x for x in chars.upper()], [i + .5 for i in range(10)]]
with open('testfile.csv', 'w', newline='') as out_file:
# now read in the file and print out its contents
with open('testfile.csv') as in_file:
Notice that the output contains no double quoted items.