将键值对中的空白值替换为字典中的新值 (pythohn 3.x)

Question

我需要创建一个字典来存储任意数量的用户名和密码对，但我不知道如何用新密码代替空白值。不幸的是，我必须先完成用户名输入，然后才能要求输入密码。

dictionary= {}   # blank database
userpassno = int(input("How many username and password pairs?"))    # user input for amount of pairs
for i in range(userpassno):     # loop that runs as many times as the number of pairs
username = input("Enter username:")     # Username input
database[username] = None               # No passwords yet
for i in range(userpassno):
password = input("Enter password:")  # password input
database[username] = password        # Puts passwords into database
print(database)

Answer 1

您可以使用列表来存储用户在第一个循环中输入的所有用户名，然后使用存储的用户名将密码输入分配给第二个循环中字典中的相应条目：

database= {}   # blank database
userpassno = int(input("How many username and password pairs?"))    # user input for amount of pairs
usernames = []
for i in range(userpassno):     # loop that runs as many times as the number of pairs
usernames.append(input("Enter username:"))     # Username input
for username in usernames:
database[username] = input("Enter password:")  # password input
print(database)