Detailed introduction to Python’s built-in hex function

English documentation:

hex(x)

Convert anintegernumber to a lowercase hexadecimalstringprefixed with “0x”,forexample

Ifx is not aPythonintobject, it has to define an index() method thatreturns an integer.

Instructions:

　1.FunctionThe function converts the decimalintegerinto hexadecimal System integer.

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

　2. If the parameter x is not an integer, it must define an index function that returns an integer.

# 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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