import csv data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] output_file = open('./data/examp_output.txt', 'w') datawriter = csv.writer(output_file) datawriter.writerows(data) output_file.close() import numpy as np data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] np.savetxt('./data/examp_output.txt', data, delimiter = ',') import pandas as pd data = pd.DataFrame([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) data.to_csv('./data/examp_output.txt')