python function - bin()

The topic "Daily Lecture on Python Functions" has been sharing with you Python's built-in functions last week. They are all explained in alphabetical order, but the four functions explained last week are not commonly used. I am very happy today , 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.

New in version 2.6.

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

Parameter x: an integer or a type that contains the __index__() method with a return value of integer;

Version: The bin function is a new function in python2.6 , pay attention to version issues 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'

PS: Changing the function is very simple, but you must pay attention to the version and parameter type.