使用max(),min(),sum()，

对象的数据类型要一致，否则报错！

>>> k

[1, 2, 3, 'k']

>>> max(k)

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

TypeError: '>' not supported between instances of 'str' and 'int'

---

 

以下几个迭代器，返回的是对象值

reversed()    #翻转

enumerate() #枚举：[(index1,value1),(index2,value2)···]

zip()             #打包

 

>>> a = [1,2,3,4,5]

>>> reversed(a)

<list_reverseiterator object at 0x000001E8118F0198>

>>> list(reversed(a))

[5, 4, 3, 2, 1]

>>> enumerate(a)

<enumerate object at 0x000001E8118F11F8>

>>> list(enumerate(a))

[(0, 1), (1, 2), (2, 3), (3, 4), (4, 5)]

>>> a

[1, 2, 3, 4, 5]

>>> b = ['a','b','c','d','e']

>>> list(zip(a,b))

[(1, 'a'), (2, 'b'), (3, 'c'), (4, 'd'), (5, 'e')]