如何在python中将用户添加到字典中并且不会覆盖其他用户

user_dict = {}  # 创建一个空字典

# 添加第一个用户
user_dict.update({"username": "user1", "age": 25, "email": "user1@example.com"})

# 添加第二个用户
user_dict.update({"username": "user2", "age": 30, "email": "user2@example.com"})

# 打印字典
print(user_dict)

{'username': 'user2', 'age': 30, 'email': 'user2@example.com'}

user_dict = {}  # 创建一个空字典

# 添加第一个用户
user_dict["username"] = "user1"
user_dict["age"] = 25
user_dict["email"] = "user1@example.com"

# 添加第二个用户
user_dict["username"] = "user2"
user_dict["age"] = 30
user_dict["email"] = "user2@example.com"

# 打印字典
print(user_dict)

{'username': 'user2', 'age': 30, 'email': 'user2@example.com'}