英文文档：

hex(x)

Convert an integer number to a lowercase hexadecimal string prefixed with “0x”, for example

If x is not a Python int object, it has to define an __index__() method that returns an integer.

说明：

1. 函数功能将10进制整数转换成16进制整数。>>> hex(15)'0xf'>>> hex(16)'0x10'

2. 如果参数x不是整数，则它必须定义一个返回整数的__index__函数。# 未定义__index__函数

>>> class Student:

def __init__(self,name,age):

self.name = name

self.age = age

>>>

>>> s = Student('Kim',10)

>>> hex(s)

Traceback (most recent call last):

File "", line 1, in hex(s)

TypeError: 'Student' object cannot be interpreted as an integer

# 定义__index__函数，但是返回字符串

>>> class Student:

def __init__(self,name,age):

self.name = name

self.age = age

def __index__(self):

return self.name

>>> s = Student('Kim',10)

>>> hex(s)

Traceback (most recent call last):

File "", line 1, in hex(s)

TypeError: __index__ returned non-int (type str)

# 定义__index__函数，并返回整数

>>> class Student:

def __init__(self,name,age):

self.name = name

self.age = age

def __index__(self):

return self.age

>>> s = Student('Kim',10)

>>> hex(s)

'0xa'

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