Python CSV 覆盖

Question

我正在尝试编写此代码，以便在它结束后保存以前的答案，并且可以再次运行代码而不会覆盖旧答案。我将 how、why 和 scale_of_ten 变量移到了“with open”部分，并且我在代码能够在文件执行的次数内工作时取得了一些成功，但每次执行时，旧答案都会被覆盖。我将如何编写代码以便在接收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

在w 模式下，open 会截断文件。使用a（追加）模式。

....

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

顺便说一句，如果您使用with 语句，则不需要f.close()。