python元组有哪些获取元素的方法

>>> letters = (‘a’, ‘b’, ‘c’)

>>> letters[2]

’c’

>>> letters = (‘a’, ‘b’, ‘c’)

>>> letters.index(‘c’)

2

>>> letters = (‘a’, ‘b’, ‘c’)

>>> ‘a’ in letters

True

>>> ‘z’ in letters

False

>>> numbers = (1, 2, 2, 3, 4, 5, 5, 7)

>>> numbers.count(5)

2