Как создать csv?

>>> import csv
>>> with open('ex.csv', 'w', newline='') as csvfile:
...    spamwriter = csv.writer(csvfile, delimiter='.', quotechar='', quoting=csv.QUOTE_NONE)
...    spamwriter.writerow(['A', 'B'])
...    spamwriter.writerow(['test', 10])

$ cat ex.csv 
A.B
test.10