在python中创建具有变量名的文件时出错

Question

from datetime import datetime
time_today = datetime.now()
todayDate = time_today.strftime('%d/%m/%Y')
filename = "Attendance - " + todayDate
with open(f'{filename}.csv', 'w') as fp:
fp.writelines(f'Name,Date,Time')

这是我创建一个具有可变文件名的新文件的代码。当我只使用filename="hello"时，它可以工作并创建hello.csv，但对于filename = "Attendance - " + todayDate，它显示以下错误：

Traceback (most recent call last):
File "e:CollegeCodingSYface-recogfile-create.py", line 6, in <module>
with open(f'{filename}.csv', 'w') as fp:
FileNotFoundError: [Errno 2] No such file or directory: 'Attendance - 29/03/2022.csv'

Answer 1

todayDate中的斜杠被python解释为路径。

你可能可以逃离它们，或者更简单的方法可能是将它们改为破折号：

todayDate = time_today.strftime('%d-%m-%Y')

Answer 2

这应该可以解决问题：

from datetime import datetime

time_today = datetime.now()
todayDate = time_today.strftime('%d/%m/%Y')
filename = "Attendance - " + str(todayDate)
with open(f'{filename}.csv', 'w') as fp:
fp.writelines(f'Name,Date,Time')