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简单介绍Python中的len()函数的使用

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2016-06-10 15:16:051895browse

函数:len()

1:作用:返回字符串、列表、字典、元组等长度

2:语法:len(str)

3:参数:
str:要计算的字符串、列表、字典、元组等

4:返回值:字符串、列表、字典、元组等元素的长度

5:实例
5.1、计算字符串的长度:

>>> s = "hello good boy doiido"
>>> len(s)
21


5.2、计算列表的元素个数:

>>> l = ['h','e','l','l','o']
>>> len(l)
5


5.3、计算字典的总长度(即键值对总数):

>>> d = {'num':123,'name':"doiido"}
>>> len(d)
2


5.4、计算元组元素个数:

>>> t = ('G','o','o','d')
>>> len(t)
4

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