Detailed explanation of bin() function of python function

"Python FunctionDaily Lecture" topic has been sharing with you Python's built-in functions last week, all explained in alphabetical order , but the four functions explained last week are not commonly used. Today I am very happy, haha, because today I want to share with you a very commonly used function: bin() function

bin (x)

##English description：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.

Chinese description: Convert the integer x to a binary string, if x is not Int type in Python, x must contain the method __index__() and the return value is integer;

Parameter x: Integer or a type that contains the __index__() method and the return value is integer;

Version: The bin function is a new function in python2.6. Please pay attention to the version issue when using it.

Explanation with examples:

#整数的情况
>>> bin(521)
#这里的显示结果形式与我们平时习惯有些差别，主要是前面多了0b，这是表示二进制的意思。
'0b1000001001'
#非整型的情况，必须包含__index__()方法切返回值为integer的类型
>>> class myType:
... 　　def __index__(self):
... 　　　　return 35
   
>>> myvar = myType()
>>> bin(myvar)
   
'0b1000001001'

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