Python內建hex函數的詳細介紹

英文文檔：

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.

說明：

　　1. 函數功能將10進位整數轉換成16進位整數。

>>> hex(15)'0xf'>>> hex(16)'0x10'

　　2. 如果參數x不是整數，則它必須定義一個返回整數的index函數。

# 未定義__index__函數>>> 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 "<pyshell#17>", line 1, in <module>    hex(s)TypeError: 'Student' object cannot be interpreted as an integer# 定義__index__函數，但是返回字串>>> 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 "<pyshell#23>", line 1, in <module>    hex(s)TypeError: __index__ returned non-int (type str)# 定義__index__函數，並返回整數>>> 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'