Writing CSV file with umlauts causing “UnicodeEncodeError: 'ascii' codec can't encode character”

Question

I am trying to write characters with double dots (umlauts) such as ä, ö and Ö. I am able to write it to the file with data.encode(\"utf-8\") but the result

Answer 1

Add a parameter encoding to the open() and set it to 'utf8'.

import csv

data = "ääÖ"
with open("test.csv", 'w', encoding='utf8') as fp:
    a = csv.writer(fp, delimiter=";")
    a.writerows(data)

Edit: Removed the use of io library as open is same as io.open in Python 3.