As is the case with any container type, you can use the built-in len method to find out how many items are in the collection.

与任何容器类型一样，可以使用内置的len方法查明集合中元素的数量。

youdao

As is the case with any container type, you can use the built-in len method to find out how many items are in the collection.

与任何容器类型一样，可以使用内置的len方法查明集合中元素的数量。

youdao