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bin() in Python

  • Difficulty Level : Easy
  • Last Updated : 01 Feb, 2018

Converting an decimal to binary is always an important utility that is required in python dev projects and competitive programming as well. Having a shorthand function to achieve this can always be handy in the situations which require the swift conversion of it without writing a long code for same, this is provided by “bin()“. This has been discussed in this article.

Naive Methods to convert decimal to binary

1. Using recursion

# Function to print binary number for the 
# input decimal using recursion
def decimalToBinary(n):
    if n > 1:
        # divide with integral result 
        # (discard remainder) 
    print (n%2,end="")         
# Driver code
if __name__ == '__main__':

Output :


2. Using loop

# Python code to demonstrate naive method
# using loop 
# function returning binary string
def Binary(n):
    binary = ""
    i = 0
    while n > 0 and i<=8:
        s1 = str(int(n%2))
        binary = binary + s1
        n /= 2
        i = i+1
        d = binary[::-1]
    return d
print("The binary representation of 100 (using loops) is : ",end="")


The binary representation of 100 (using loops) is : 001100100

Using bin()

Using bin() reduces the time required to code and also removes the hassle that you may see in the above two mentioned methods.

Syntax : 
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 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="")

Output :

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

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

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