需要帮助将时间戳正确传递给字典

Question

我目前正在尝试制作一个请求用户输入的程序，该程序被存储到字典和嵌套字典中。

一切正常，但让我感到困惑的一件事是创建一个键，该键存储字典存储在 while 循环中的日期时间。

from datetime import datetime

now = datetime.now()
user_list = {}
list_of_users = {}

while True: 

    print("Please enter your desired username below")
    username = input("What is your username? ")

    if username == 'print':
        break

    else:
        first = input("What is your first name? ")

        list_of_users.update({username : user_list})
        user_list['given name'] = first
        user_list['given name'] = username
        user_list['date'] = now.strftime("%Y-%m-%d %H:%M:%S")

print(list_of_users)

这是一个示例输出。如您所见，字典的日期值具有相同的确切时间。我希望时间基于数据存储在 while 循环中的时间：

Please enter your desired username below
What is your username? monkey
What is your first name? john
Please enter your desired username below
What is your username? simon
What is your first name? whistler
Please enter your desired username below
What is your username? print
{'monkey': {'given name': 'simon', 'date': '2019-11-04 13:16:35'}, 'simon': {'given name': 'simon',     'date': '2019-11-04 13:16:35'}}

提前感谢您的帮助！

Answer 1

您需要在每次迭代中分别创建now。 现在您只在程序开始时创建日期对象，因此它在其余的执行过程中保持不变。

from datetime import datetime

user_list = {}
list_of_users = {}

while True: 

  print("Please enter your desired username below")
  username = input("What is your username? ")

  if username == 'print':
    break
  else:
    first = input("What is your first name? ")
    now = datetime.now()
    list_of_users.update({username : user_list})
    user_list['given name'] = first
    user_list['given name'] = username
    user_list['date'] = now.strftime("%Y-%m-%d %H:%M:%S")

    print(list_of_users)

Answer 2

您在代码开头初始化了变量now，并在while循环中使用它。

如果你想要正确的输出，你需要删除

now = datetime.now()

并使用

user_list['date'] = datetime.now().strftime("%Y-%m-%d %H:%M:%S")