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Python Program to Generate Random binary string

  • Last Updated : 08 Oct, 2021

Given a number n, the task is to generate a random binary string of length n.

Input: 7
Output: Desired length random binary string is:  1000001

Input: 5
Output: Desired length random binary string is:  01001


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  • Initialize an empty string, say key 
  • Generate a randomly either “0” or “1” using randint function from random package. 
  • Append the randomly generated “0” or “1” to the string, key 
  • Repeat step 2 and 3 for the desired length of the string 

Below is the implementation.


# Python program for random
# binary string generation
import random
# Function to create the
# random binary string
def rand_key(p):
    # Variable to store the
    # string
    key1 = ""
    # Loop to find the string
    # of desired length
    for i in range(p):
        # randint function to generate
        # 0, 1 randomly and converting
        # the result into str
        temp = str(random.randint(0, 1))
        # Concatenation the random 0, 1
        # to the final result
        key1 += temp
# Driver Code
n = 7
str1 = rand_key(n)
print("Desired length random binary string is: ", str1)


Desired length random binary string is:  1000001
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