how to output a list within a list as a csv code example

Example 1: list to csv

import csv

with open("out.csv", "w", newline="") as f:
    writer = csv.writer(f)
    writer.writerows(a)

Example 2: write a list into csv python

# Convert a list into rows for a column in csv

import csv
for_example = [1, 2, 3, 4, 5, 6]
with open('output.csv', 'w', newline='') as csv_1:
  csv_out = csv.writer(csv_1)
  csv_out.writerows([for_example[index]] for index in range(0, len(for_example)))