bin() in Python

Python bin() function returns the binary string of a given integer.

Syntax:  bin(a)

Parameters : a : an integer to convert

Return Value : A binary string of an integer or int object.

Exceptions : Raises TypeError when a float value is sent in arguments.

Python bin() Example

Example 1: Convert integer to binary with bin() methods

Python3

# Python code to demonstrate working of
# bin()

# declare variable
num = 100

# print binary number
print(bin(num))

Output:

0b1100100

Example 2: Convert integer to binary with user define function

Python3

# Python code to demonstrate working of
# bin()

# function returning binary string
def Binary(n):
    s = bin(n)

    # removing "0b" prefix
    s1 = s[2:]
    return s1

print("The binary representation of 100 (using bin()) is : ", end="")
print(Binary(100))

Output: 

The binary representation of 100 (using bin()) is : 1100100

Example 3: user-defined object to binary using bin() and __index()__

Here we send the object of the class to the bin methods, and we are using python special methods __index()__ method which always returns positive integer, and it can not be a rising error if the value is not an integer. 

Python3

# Python code to demonstrate working of
# bin()
class number:
    num = 100

    def __index__(self):
        return(self.num)

print(bin(number()))

Output:

0b1100100

This article is contributed by Manjeet Singh. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.