password-strength-checker.py

import re       #imports regular expressions

def checkPassword(password):    #checks to see if password meets the requirements
    requirements = {            #defines the requirements for the password
        "length"  : 8,
        "lowers"  : 1,
        "uppers"  : 1,
        "numbers" : 1,
        "symbols" : 1
    }
    
    checks = {}
    
    checks["lenth"] = len(password) >= requirements["length"]                   #checks to see if the password is long enough
    checks["lowers"] = re.search(r"[a-z]", password) is not None                #checks to see if the password contains lower case characters
    checks["uppers"] = re.search(r"[A-Z]", password) is not None                #checks to see if the password contains upper case characters
    checks["numbers"] = re.search(r"\d", password) is not None                                  #checks to see if the password contains numbers
    checks["symbols"] = re.search(r"[ !#$%&'()*+,-./[\\\]^_`{|}~"+r'"]', password) is not None  #checks to see if the password contains symbols
    
    overall_strength = 0
    
    for key in checks.keys():       #loops through all the checks
        if checks[key]:             #checks to see if the check has been passed
            overall_strength += 1   #totals up the number of passed checks
    
    print(overall_strength)
    
    match overall_strength:                                     #checks the strength of the password
        case overall_strength if overall_strength in [0, 1, 2]: #if the password passes < 3 checks, its deemed weak
            checks["strength"] = "weak"
        case overall_strength if overall_strength in [3, 4]:    #if the password passes < 5 checks, its deemed moderate
            checks["strength"] = "moderate"
        case 5:                                                 #if the password passes all checks, its deemed strong
            checks["strength"] = "strong"
    
    return checks



password = input("please enter the password: ") #takes the users password input

print(checkPassword(password))                  #outputs the checks on the password