Python CSV覆盖

Question

我正在尝试编写此代码，以便一旦结束，之前的答案将被保存，代码可以再次运行，而不会覆盖旧的答案。我将how，why和scale_of_ten变量转换为'with open'部分，并且我已经取得了一些成功，代码能够在文件执行的次数上工作，但每次执行时，旧的答案都会被覆盖。我如何编写代码，以便在获得新答案时保存旧答案？

import csv
import datetime
# imports modules

now = datetime.datetime.now()
# define current time when file is executed

how = str(raw_input("How are you doing?"))
why = str(raw_input("Why do you feel that way?"))
scale_of_ten = int(raw_input("On a scale of 1-10. With 10 being happy and 1 being sad. How happy are you?"))
#creates variables for csv file

x = [now.strftime("%Y-%m-%d %H:%M"),how,why,scale_of_ten]
# creates list for variables to be written in

with open ('happy.csv','wb') as f:
    wtr = csv.writer(f)
    wtr.writerow(x)
    wtr.writerow(x)
    f.close()

Answer 1

使用w模式，open会截断文件。使用a（追加）模式。

....

with open ('happy.csv', 'ab') as f:
    #                    ^
    ....

BTW，如果您使用f.close()语句，则不需要with。