python convert函数_Python内置函数
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進制整數轉換成16進制整數。>>> 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 "", line 1, in hex(s)
TypeError: 'Student' object cannot be interpreted as an integer
# 定義__index__函數,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)
# 定義__index__函數,并返回整數
>>> 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'
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