Question 18.py

# A website requires the users to input username and password to register.
# Write a program to check the validity of password input by users.
# Following are the criteria for checking the password:

# At least 1 letter between [a-z]
# At least 1 number between [0-9]
# At least 1 letter between [A-Z]
# At least 1 character from [$#@]
# Minimum length of transaction password: 6
# Maximum length of transaction password: 12

# Your program should accept a sequence of comma separated passwords and will check them
# according to the above criteria. Passwords that match the criteria are to be printed,
# each separated by a comma.

# Example:
## If the following passwords are given as input to the program:
## ABd1234@1,a F1#,2w3E*,2We3345
# Then, the output of the program should be:
## ABd1234@1

#MY SOLUTION
import re

print('Enter your passwords:')
x = input().split(',')
y = []
# print(x)

for password in x:
    if re.match(r"^(?=.*[a-z])(?=.*[0-9])(?=.*[A-Z])(?=.*[$#@]).{6,12}$", password):
        print(password)

#COURSE SOLUTION
def is_low(x):                  # Returns True  if the string has a lowercase
    for i in x:
        if 'a'<=i and i<='z':
            return True
    return  False

def is_up(x):                   # Returns True  if the string has a uppercase
    for i in x:
        if 'A'<= i and i<='Z':
            return True
    return  False

def is_num(x):                  # Returns True  if the string has a numeric digit
    for i in x:
        if '0'<=i and i<='9':
            return True
    return  False

def is_other(x):                # Returns True if the string has any "$#@"
    for i in x:
        if i=='$' or i=='#' or i=='@':
            return True
    return False

s = input().split(',')
lst = []

for i in s:
    length = len(i)
    if 6 <= length and length <= 12 and is_low(i) and is_up(i) and is_num(i) and is_other(i):   #Checks if all the requirments are fulfilled
        lst.append(i)

print(",".join(lst))