假设我有用户(约翰,安娜)可以按自己选择的数量订购水果(橙子,苹果).
这是我在python中所做的:
orders = (('John', (('apples', 3), ('oranges', 1))),
('Anna', (('oranges', 6))))
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我想迭代订单:
for user, order in orders:
for fruit, quantity in order:
print "%s wants %d %s" % (user, quantity, fruit)
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这是我期待的输出:
John wants 3 apples
John wants 1 oranges
Anna wants 6 oranges
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我得到了ValueError: too many values to unpack.我究竟做错了什么?我应该使用除元组以外的其他东西吗?这是我的迭代不好吗?