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:
>>> 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 "<pyshell#17>", line 1, in <module> 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 "<pyshell#23>", line 1, in <module> 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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