Python 内建函数 - bin(x)

Manual

Convert an integer number to a binary string. The result is a valid Python expression. If x is not a Python int object, it has to define an__index__() method that returns an integer.

直译

将整数转换为二进制字符串。结果为有效的Python表达式。如果‘x’不是一个Python整数对象，就必须通过定义一个index()方法来返回一个整数。

实例

整数对象

>>> bin(338)
'0b101010010'
>>> bin(250)
'0b11111010'

非整数对象

>>> class soShanPao:
      def __index__(self):
        return 520
>>> shanPao = soShanPao()
>>> bin(shanPao)
'0b1000001000'