In this program, we will be taking a password as a combination of alphanumeric characters along with special characters, and check whether the password is valid or not with the help of few conditions.
Primary conditions for password validation :
- Minimum 8 characters.
- The alphabets must be between [a-z]
- At least one alphabet should be of Upper Case [A-Z]
- At least 1 number or digit between [0-9].
- At least 1 character from [ _ or @ or $ ].
Examples:
Input : R@m@_f0rtu9e$ Output : Valid Password Input : Rama_fortune$ Output : Invalid Password Explanation: Number is missing Input : Rama#fortu9e Output : Invalid Password Explanation: Must consist from _ or @ or $
Here we have used the re module that provide support for regular expressions in Python. Along with this the re.search() method returns False (if the first parameter is not found in the second parameter) This method is best suited for testing a regular expression more than extracting data. We have used the re.search() to check the validation of alphabets, digits or special characters. To check for white spaces we use the “\s” which comes in the module of the regular expression.
# Python program to check validation of password # Module of regular expression is used with search() import re password = "R@m@_f0rtu9e$"flag = 0while True: if (len(password)<8): flag = -1 break elif not re.search("[a-z]", password): flag = -1 break elif not re.search("[A-Z]", password): flag = -1 break elif not re.search("[0-9]", password): flag = -1 break elif not re.search("[_@$]", password): flag = -1 break elif re.search("\s", password): flag = -1 break else: flag = 0 print("Valid Password") break if flag ==-1: print("Not a Valid Password") |
Valid Password
Alternative Method:-
l, u, p, d = 0, 0, 0, 0s = "R@m@_f0rtu9e$"if (len(s) >= 8): for i in s: # counting lowercase alphabets if (i.islower()): l+=1 # counting uppercase alphabets if (i.isupper()): u+=1 # counting digits if (i.isdigit()): d+=1 # counting the mentioned special characters if(i=='@'or i=='$' or i=='_'): p+=1 if (l>=1 and u>=1 and p>=1 and d>=1 and l+p+u+d==len(s)): print("Valid Password") else: print("Invalid Password") |
Valid Password
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