Python Program to Generate Random binary string

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

Input: 7 Output: Desired length of random binary string is: 1000001 Input: 5 Output: Desired length of random binary string is: 01001

Approach

• 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 return(key1) # Driver Code n = 7 str1 = rand_key(n) print("Desired length random binary string is: ", str1) 

Output:

Desired length random binary string is: 1000001

The Time and Space Complexity for all the methods are the same:

Time Complexity: O(n)

Auxiliary Space: O(n)

Using random.getrandbits():

import random def generate_binary_string(n): # Generate a random number with n bits number = random.getrandbits(n) # Convert the number to binary binary_string = format(number, '0b') return binary_string # Test the function n = 7 print("Random binary string of length {}: {}".format(n, generate_binary_string(n))) #This code is contributed by Edula Vinay Kumar Reddy 

Random binary string of length 7: 1010000

Explanation:

The random.getrandbits(n) function generates a random number with n bits.
The format() function is used to convert the number to binary format. The format string '0b' specifies that the output should be in binary form.
 

Time Complexity: O(n), where n is the number of bits in the binary string.

Auxiliary Space: O(n), where n is the number of bits in the binary string. This is the space required to store the binary string.