Python - datetime - 檢查用戶輸入的日期是否匹配格式

Question

導入日期時間，我想驗證用戶輸入日期以查看它是否與 YYYY-MM-DD 匹配。 如果沒有，請 print('Sorry wrong format, try again.') 並要求他們再次輸入日期，如果他們確實輸入了正確的格式。 function 繼續向用戶提出下一個問題，現在。 我的代碼拒絕所有日期格式（即使是正確的）。 最終希望在單獨的 function 中驗證 function，這樣它就更干凈了。

def add_new_entry(entries):
    
  date = input('When was the transaction? (YYYY-MM-DD): ')
    try:
      transaction_date = datetime.datetime.strptime(date, "%Y/%m/%D")  
    except ValueError:
      print("Sorry, that is in the incorrect format. Try again!")
      return add_new_entry(date)
    transaction = input('Was it Income or Expense? ')
    amount = input('What was the dollar amout? $')
    note = input('Describe the transaction: ')

Answer 1

日期格式不正確。 它應該是%Y-%m-%d 。 strftime() 和 strptime() 格式代碼的文檔

import datetime


def add_new_entry():
    date = input('When was the transaction? (YYYY-MM-DD): ')
    try:
        transaction_date = datetime.datetime.strptime(date, "%Y-%m-%d")
    except ValueError:
        print("Sorry, that is in the incorrect format. Try again!")
        return add_new_entry()
    transaction = input('Was it Income or Expense? ')
    amount = input('What was the dollar amount? $')
    note = input('Describe the transaction: ')
    return date, transaction, amount, note


print(add_new_entry())

Output：

When was the transaction? (YYYY-MM-DD): 2022-01-69
Sorry, that is in the incorrect format. Try again!
When was the transaction? (YYYY-MM-DD): 2022-23-32
Sorry, that is in the incorrect format. Try again!
When was the transaction? (YYYY-MM-DD): 2022-01-08
Was it Income or Expense? Income
What was the dollar amount? $2222
Describe the transaction: Salary
('2022-01-08', 'Income', '2222', 'Salary')

解釋：

• 當執行except塊時，我已經刪除了我假設的參數date ，您想讓用戶重新輸入日期。

參考：

• strftime() 和 strptime() 格式代碼的文檔