使用python将每个结果保存在换行符中的csv文件中

Question

I've been trying to create a csv file using python and save a new date on a new row. My intention is to replicate the shell output(shown below), in csv file. However the output I get is only saving the last result and iterating through one date(shown in the csv output below). I'm sure there's an error in my approach but I'm stumped. thanks in advance.

from datetime import timedelta, date
import csv

def daterange(start_date, end_date):
    for n in range(int ((end_date - start_date).days)):
        yield start_date + timedelta(n)

start_date = date(2014, 12, 28)
end_date = date(2015, 1, 10)

for single_date in daterange(start_date, end_date):
    new_date = single_date.strftime("%Y-%m-%d")
    with open('output.csv', 'wb') as f:
        writer = csv.writer(f)
        writer.writerows(new_date)

shell output csv output

Answer 1

When you open a file with w mode, python truncates the file. You should open it only once:

with open('output.csv', 'wb') as f:
    writer = csv.writer(f)
    for single_date in daterange(start_date, end_date):
        new_date = single_date.strftime("%Y-%m-%d")
        writer.writerow(new_date)