Python Program to generate a Random String

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Using random.choice()

The random.choice() function is used in the python string to generate the sequence of characters and digits that can repeat the string in any order.

Create a program to generate a random string using the random.choices() function.

Random_str.py

import string    
import random # define the random module  
S = 10  # number of characters in the string.  
# call random.choices() string module to find the string in Uppercase + numeric data.  
ran = ''.join(random.choices(string.ascii_uppercase + string.digits, k = S))    
print("The randomly generated string is : " + str(ran)) # print the random data  

 

Output:

Following are the method used in the random module to generate the random string.

Methods	Description
String.ascii_letters	It returns a random string that contains both uppercase and lowercase characters.
String_ascii_uppercase	It is a random string method that only returns a string in uppercase characters.
String.ascii_lowercase	It is a random string method that returns a string only in lowercase characters.
String.digits	It is a random string method that returns a string with numeric characters.
String.punctuation	It is a random string method that returns a string with punctuation characters.

 

Generate a random string of upper case and lower-case letters

UprLwr.py

# write a program to generate the random string in upper and lower case letters.  

import random  
import string  
def Upper_Lower_string(length): # define the function and pass the length as argument  
    # Print the string in Lowercase  
    result = ''.join((random.choice(string.ascii_lowercase) for x in range(length))) # run loop until the define length  
    print(" Random string generated in Lowercase: ", result)  
  
    # Print the string in Uppercase  
    result1 = ''.join((random.choice(string.ascii_uppercase) for x in range(length))) # run the loop until the define length  
    print(" Random string generated in Uppercase: ", result1)  
  
Upper_Lower_string(10) # define the length  

 

Output:

Random String of Specified Characters

Specific.py

# create a program to generate the random string of given letters.  

import random  
import string  
def specific_string(length):  
    sample_string = 'pqrstuvwxy' # define the specific string  
    # define the condition for random string  
    result = ''.join((random.choice(sample_string)) for x in range(length))  
    print(" Randomly generated string is: ", result)  
  
specific_string(8) # define the length  
specific_string(10)  

 

Output:

Note: The random.choice() method is used in the python program to repeat the same characters strings. If we don't want to display repetitive characters, we should use random.sample() function.

 

Generate a random string without repeating the same characters

WithoutRepeat.py

# create a program to generate a string with or without repeating the characters.  

import random  
import string  
print("Use of random.choice() method")  
def specific_string(length):  
     
    letters = string.ascii_lowercase # define the lower case string  
     # define the condition for random.choice() method  
    result = ''.join((random.choice(letters)) for x in range(length))  
    print(" Random generated string with repetition: ", result)  
  
specific_string(8) # define the length  
specific_string(10)  
  
  
print("") # print the space  
print("Use of random.sample() method")  
def WithoutRepeat(length):  
    letters = string.ascii_lowercase # define the specific string  
    # define the condition for random.sample() method  
    result1 = ''.join((random.sample(letters, length)))   
    print(" Random generated string without repetition: ", result1)  
  
WithoutRepeat(8) # define the length  
WithoutRepeat(10)   

 

Output:

 

As we can see in the above output, the random.sample() method returns a string in which all characters are unique and non-repeating. Whereas, the random.choice() method returns a string that may contain repetitive characters. So, we can say that if we want to generate a unique random string, use random.sample() method.

Generate a random alphanumeric string consisting of fixed letters and digits

For example, suppose we want a randomly generated alphanumeric string that contains five letters and four digits. We need to define these parameters into the function.

Let's write a program to generate an alphanumeric string that contains a fixed number of letters and digits.

 

fixedString.py

import random  
import string  
def random_string(letter_count, digit_count):  
    str1 = ''.join((random.choice(string.ascii_letters) for x in range(letter_count)))  
    str1 += ''.join((random.choice(string.digits) for x in range(digit_count)))  
  
    sam_list = list(str1) # it converts the string to list.  
    random.shuffle(sam_list) # It uses a random.shuffle() function to shuffle the string.  
    final_string = ''.join(sam_list)  
    return final_string  
  
# define the length of the letter is eight and digits is four  
print("Generated random string of first string is:", random_string(8, 4))  
  
# define the length of the letter is seven and digits is five  
print("Generated random string of second string is:", random_string(7, 5))  

 

Output:

 

Using secrets.choice()

A secrets.choice() method is used to generate a more secure random string than random.choice(). It is a cryptographically random string generator that ensures no two processes can obtain the same results simultaneously using secrets.choice() method.

Let's write a program to print a secure random string using the secrets.choice method.

 

Secret_str.py

import random   
import string  
import secrets # import package  
num = 10 # define the length of the string  
# define the secrets.choice() method and pass the string.ascii_letters + string.digits as an parameters.  
res = ''.join(secrets.choice(string.ascii_letters + string.digits) for x in range(num))  
  
# print the Secure string   
print("Secure random string is :"+ str(res))

  

Output:

 

Use the different method of the random module to generate a safe random string.

Let's write a program to print secure random strings using different methods of secrets.choice().

Secret.py

# write a program to display the different random string method using the secrets.choice().  

# imports necessary packages  

import random   
import string  
import secrets  
num = 10 # define the length of the string  
# define the secrets.choice() method and pass the string.ascii_letters + string.digits as an parameters.  
res = ''.join(secrets.choice(string.ascii_letters + string.digits) for x in range(num))  
# Print the Secure string with the combination of ascii letters and digits  
print("Secure random string is :"+ str(res))  
  
res = ''.join(secrets.choice(string.ascii_letters) for x in range(num))  
# Print the Secure string with the combination of ascii letters   
print("Secure random string is :"+ str(res))  
  
res = ''.join(secrets.choice(string.ascii_uppercase) for x in range(num))  
# Print the Secure string in Uppercase  
print("Secure random string is :"+ str(res))  
  
res = ''.join(secrets.choice(string.ascii_lowercase) for x in range(num))  
# Print the Secure string in Lowercase  
print("Secure random string is :"+ str(res))  
  
res = ''.join(secrets.choice(string.ascii_letters + string.punctuation) for x in range(num))  
# Print the Secure string with the combination of letters and punctuation  
print("Secure random string is :"+ str(res))  
  
res = ''.join(secrets.choice(string.digits) for x in range(num))  
# Print the Secure string using string.digits  
print("Secure random string is :"+ str(res))  
  
res = ''.join(secrets.choice(string.ascii_letters + string.digits + string.punctuation) for x in range(num))  
# Print the Secure string with the combonation of letters, digits and punctuation   
print("Secure random string is :"+ str(res))  

 

Output:

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