python - 如何获取列表中的元素数量？(How do I get the number of elements in a list?)

Question

Consider the following:

(考虑以下：)

items = []
items.append("apple")
items.append("orange")
items.append("banana")

# FAKE METHOD:
items.amount()  # Should return 3

How do I get the number of elements in the list items ?

(如何获取列表items的元素数？)

  ask by y2k translate from so

Answer 1

The len() function can be used with several different types in Python - both built-in types and library types.

(len()函数可与Python中的几种不同类型一起使用-内置类型和库类型。)

For example:

(例如：)

>>> len([1,2,3])
3

Official 2.x documentation is here: len()

(官方2.x文档在这里： len())
Official 3.x documentation is here: len()

(正式的3.x文档在这里： len())