CheckIO - Home Challenge 3 : House Password

checkio.1.03.HousePassword.py

# CheckIO - Home Challenge 3 : House Password
# http://checkio.org

# Stephan and Sophia forget about security and use simple passwords for everything. 
# Help Nikola develop a password security check module. 
# The password will be considered strong enough if its length is greater than or equal to 10 symbols, 
# it has at least one digit, as well as containing one uppercase letter and one lowercase letter in it.
# The password contains only ASCII latin letters or digits.
# Input: A password as a string (Unicode for python 2.7).
# Output: Is the password safe or not as a boolean or any data type that can be converted and processed as a boolean. In the results you will see the converted results.
# Precondition:
#     re.match("[a-zA-Z0-9]+", password) 
#     0 < len(password) ≤ 64

def checkio(data):

    # Checking Length
    length=len(data)
    if (length < 10):
        return False
    
    # Checking characters
    digit=False
    upper=False
    lower=False
    i=0
    while (i<length and (not(digit) or not(upper) or not(lower))):
        char=data[i]
        if (char.isupper()): 
            upper=True
        elif (char.isdigit()): 
            digit=True
        elif (char.islower()): 
            lower=True
        i+=1
    
    # Final validation
    return (digit and upper and lower)


if __name__ == '__main__':
    #These "asserts" using only for self-checking and not necessary for auto-testing
    assert checkio('A1213pokl') == False, "1st example"
    assert checkio('bAse730onE4') == True, "2nd example"
    assert checkio('asasasasasasasaas') == False, "3rd example"
    assert checkio('QWERTYqwerty') == False, "4th example"
    assert checkio('123456123456') == False, "5th example"
    assert checkio('QwErTy911poqqqq') == True, "6th example"