python - 鸭子类型(duck typing)以允许元组、列表或可以像一个一样对待的东西

Question

def foo(spam, obj_of_interest):
"""Pass a _____ and an object of interest, and return [something that does something worthwhile] """
    name = spam[0]
    quest = spam[1]
    fav_color = spam[2]
    # ... interesting code
    return obj_of_interest

你会注意到 foo() 可以完美地运行，无论它是作为列表、元组还是作为任何强制执行命令的东西传递给 spam到元素，可以像列表一样寻址。

如何在不告诉用户使用特定类型的情况下记录这一事实？

Answer 1

你说，

"""spam is an object that supports indexing."""