Master Python for security! Learn Python basics by creating a random password generator. In this tutorial, we will see how to create a random password generator using Python.
Passwords are a means by which a user proves that they are authorized to use a device. It is important that passwords must be long and complex. It should contain at least more than ten characters with a combination of characters such as percent (%), commas(,), and parentheses, as well as lower-case and upper-case alphabets and numbers. Here we will create a random password using Python code.
Example of a weak password: password123
Example of a strong password: &gj5hj&*178a1
string – For accessing string constants. The ones we would need are –
random – The python random module helps a user to generate pseudo-random numbers. Inside the module, there are various functions that just depend on the function “random()”. This function generates a random float uniformly in the semi-open range [0.0, 1.0) i.e. it generates a decimal number greater than or equal to 0 and strictly less than one. Other functions use this number in their own ways. These functions can be used for bytes, integers, and sequences. for our task, we are interested in sequences. There are functions random. choices that take in a sequence as its argument and return a random element from that sequence.
First, take the length of the password as input. Then we can display a prompt about the possible list of characters that a user wants to include in the password –
Run a for loop till the length of the password and in each iteration choose a random character using random.choice() from characterList. Finally, print the password.
import string
import random
# Getting password length
length = int(input("Enter password length: "))
print('''Choose character set for password from these :
1. Digits
2. Letters
3. Special characters
4. Exit''')
characterList = ""
# Getting character set for password
while(True):
choice = int(input("Pick a number "))
if(choice == 1):
# Adding letters to possible characters
characterList += string.ascii_letters
elif(choice == 2):
# Adding digits to possible characters
characterList += string.digits
elif(choice == 3):
# Adding special characters to possible
# characters
characterList += string.punctuation
elif(choice == 4):
break
else:
print("Please pick a valid option!")
password = []
for i in range(length):
# Picking a random character from our
# character list
randomchar = random.choice(characterList)
# appending a random character to password
password.append(randomchar)
# printing password as a string
print("The random password is " + "".join(password))
Output:
Input 1: Taking only letters in the character set
Output
Input 1: Taking letters and numbers both
Output
Input 3: Taking letters numbers as well as special characters
Output
Implementation
# import modules
import string
import random
# store all characters in lists
s1 = list(string.ascii_lowercase)
s2 = list(string.ascii_uppercase)
s3 = list(string.digits)
s4 = list(string.punctuation)
# Ask user about the number of characters
user_input = input("How many characters do you want in your password? ")
# check this input is it number? is it more than 8?
while True:
try:
characters_number = int(user_input)
if characters_number < 8:
print("Your number should be at least 8.")
user_input = input("Please, Enter your number again: ")
else:
break
except:
print("Please, Enter numbers only.")
user_input = input("How many characters do you want in your password? ")
# shuffle all lists
random.shuffle(s1)
random.shuffle(s2)
random.shuffle(s3)
random.shuffle(s4)
# calculate 30% & 20% of number of characters
part1 = round(characters_number * (30/100))
part2 = round(characters_number * (20/100))
# generation of the password (60% letters and 40% digits & punctuations)
result = []
for x in range(part1):
result.append(s1[x])
result.append(s2[x])
for x in range(part2):
result.append(s3[x])
result.append(s4[x])
# shuffle result
random.shuffle(result)
# join result
password = "".join(result)
print("Strong Password: ", password)
Output:
#python #security