序列类型(列表和元祖包括字符串等)通用的的内建函数

>>> name
[‘kebi‘, ‘maoxian‘, ‘xiaoniao‘, ‘xinye‘]
>>> number = (1,3,4,2)
>>> st = ‘Hello,World‘
>>> len(number)
4
>>> len(name)
4
>>> len(st)   #字符串也是序列的一种特殊情况
11

>>> number = (1,3,4,2)
>>> name = [‘kebi‘, ‘maoxian‘, ‘xiaoniao‘, ‘xinye‘]
>>> st = ‘Hello,World‘
>>> max(number)
4
>>> max(name)
‘xinye‘
>>> max(st)
‘r‘
>>> ord(‘W‘)   #调用ord()函数可以查询字符串的顺序
87
>>> ord(‘r‘)
114
>>> min(number)
1
>>> min(name)
‘kebi‘
>>> min(st)
‘,‘

>>> number
(1, 3, 4, 2)              #元祖
>>> st
‘Hello,World‘             #字符串
>>> s                        
[‘They‘, ‘stamp‘, ‘them‘, ‘when‘, ‘samll‘]   #列表

>>> sorted(number)
[1, 2, 3, 4]            #元祖变为列表
>>> sorted(st)             
[‘,‘, ‘H‘, ‘W‘, ‘d‘, ‘e‘, ‘l‘, ‘l‘, ‘l‘, ‘o‘, ‘o‘, ‘r‘]    #字符串变为列表
>>> sorted(s)
[‘They‘, ‘samll‘, ‘stamp‘, ‘them‘, ‘when‘]   

>>> list(st)
[‘H‘, ‘e‘, ‘l‘, ‘l‘, ‘o‘, ‘,‘, ‘W‘, ‘o‘, ‘r‘, ‘l‘, ‘d‘]

>>> reversed(number):   #直接访问是不行的
  File "<stdin>", line 1
    reversed(number):
                    ^
SyntaxError: invalid syntax

>>> number
(1, 3, 4, 2)
>>> st
‘Hello,World‘
>>> s
[‘They‘, ‘stamp‘, ‘them‘, ‘when‘, ‘samll‘]

>>> for i in reversed(number):    #作用于元祖
...     print(i)
...
2                         #结果从后往前打印
4
3
1

>>> for i in reversed(st):     #作用于字符串
...     print(i)
...
d
l
r
o
W
,
o
l
l
e
H

>>> for t in reversed(s):    #作用于列表
...     print(t)
...
samll
when
them
stamp
They

>>> number
(1, 3, 4, 2)
>>> sum(number)
10
>>> sum(number,5)
15

>>> number2 = [1,2,3,4]
>>> stt = ‘1234‘
>>> sum(number2)
10
>>> sum(stt)         #字符串不行
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: ‘int‘ and ‘str‘

>>> s                     #不是数字不行
[‘They‘, ‘stamp‘, ‘them‘, ‘when‘, ‘samll‘]
>>> sum(s)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: ‘int‘ and ‘str‘

>>> enumerate(number)
<enumerate object at 0x0000015E5B56E678>  #返回的是一个对象

>>> for i in enumerate(number):
...     print(i)
...
(0, 1)
(1, 3)                  #对字符串、元祖和列表都有用
(2, 4)
(3, 2)

>>> for i in enumerate(st):
...     print(i)
...
(0, ‘H‘)
(1, ‘e‘)
(2, ‘l‘)
(3, ‘l‘)
(4, ‘o‘)
(5, ‘,‘)
(6, ‘W‘)
(7, ‘o‘)
(8, ‘r‘)
(9, ‘l‘)
(10, ‘d‘)

>>> for i in enumerate(name):
...     print(i)
...
(0, ‘kebi‘)
(1, ‘maoxian‘)
(2, ‘xiaoniao‘)
(3, ‘xinye‘)

>>> name
[‘kebi‘, ‘maoxian‘, ‘xiaoniao‘, ‘xinye‘]
>>> st
‘Hello,World‘
>>> s
[‘They‘, ‘stamp‘, ‘them‘, ‘when‘, ‘samll‘]
>>> number
(1, 3, 4, 2)

>>> zip(name,s)    #返回的是一个对象
<zip object at 0x0000015E5B5734C8>

>>> for i in zip(name,s):        #列表+列表
...     print(i)
...
(‘kebi‘, ‘They‘)
(‘maoxian‘, ‘stamp‘)
(‘xiaoniao‘, ‘them‘)
(‘xinye‘, ‘when‘)

>>> for i in zip(s,name):        #以长度最短的一个序列为结束标志
...     print(i)
...
(‘They‘, ‘kebi‘)
(‘stamp‘, ‘maoxian‘)
(‘them‘, ‘xiaoniao‘)
(‘when‘, ‘xinye‘)

>>> for i in zip(name,number):    #列表+元祖
...     print(i)
...
(‘kebi‘, 1)
(‘maoxian‘, 3)
(‘xiaoniao‘, 4)
(‘xinye‘, 2)

>>> for i in zip(name,st):   #列表+字符串
...     print(i)
...
(‘kebi‘, ‘H‘)
(‘maoxian‘, ‘e‘)
(‘xiaoniao‘, ‘l‘)
(‘xinye‘, ‘l‘)

>>> for i in zip(name,number,st):  #多个可以组合
...     print(i)
...
(‘kebi‘, 1, ‘H‘)
(‘maoxian‘, 3, ‘e‘)
(‘xiaoniao‘, 4, ‘l‘)
(‘xinye‘, 2, ‘l‘)