英文文件：
bin(x)
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__()##__index__() method that returns an integer.
說明：
1. 將一個整形數字轉換成二進位字串>>> b = bin(3) >>> b '0b11' >>> type(b) #获取b的类型 <class 'str'>
>>> class A:
pass
>>> a = A()
>>> bin(a)
Traceback (most recent call last):
File "<pyshell#15>", line 1, in <module>
bin(a)
TypeError: 'A' object cannot be interpreted as an integer>>> class B:
def __index__(self):
return "3"
>>> b = B()
>>> bin(b)
Traceback (most recent call last):
File "<pyshell#21>", line 1, in <module>
bin(b)
TypeError: __index__ returned non-int (type str)>>> class C:
def __index__(self):
return 3
>>> c = C()
>>> bin(c)
'0b11'#
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