从字典内的列表中获取字典值

user_orders = {
    'user1': ['order1', 'order2'],
    'user2': ['order3'],
    'user3': ['order4', 'order5', 'order6']
}

# 获取'user1'的订单列表
orders_user1 = user_orders['user1']
print(orders_user1)  # 输出: ['order1', 'order2']

# 获取'user2'的第一个订单
first_order_user2 = user_orders['user2'][0]
print(first_order_user2)  # 输出: 'order3'

# 使用get方法避免KeyError
orders_user4 = user_orders.get('user4', [])
print(orders_user4)  # 输出: []

# 安全地获取列表中的元素
user = 'user3'
if user_orders.get(user):
    last_order = user_orders[user][-1]  # 获取最后一个订单
    print(last_order)
else:
    print(f"No orders found for user {user}")