import string

#
# module passwords
#
# Functions for testing the security/validity of a password.
#


#
# isValid1:  A function that checks whether a password is secure by
#   testing each character individually.
#
# Parameters:
#   password: string representing a password
#
# Returns:  true if the following conditions are satisfied
#   at least one uppercase char
#   at least one lowercase char
#   at least one numeric digit
#   length >= 7
#
def isValid1(password):
    #
    # Read each character, test whether current char satisfies one of the properties
    # Required properties:
    #   at least one uppercase char
    #   at least one lowercase char
    #   at least one numeric digit
    #
    uppercase = False
    lowercase = False
    digit = False
    for ch in password:
        if (ch >= 'A') and (ch <= 'Z'):
            uppercase = True
        if (ch >= 'a') and (ch <= 'z'):
            lowercase = True
        if (ch >= '0') and (ch <= '9'):
            digit = True

    #
    # password is "secure" if all 3 properties are satisfied and has at least 7 chars
    #
    if (uppercase == True) and (lowercase == True) and (digit == True) and (len(password) >= 7):
        return True
    else:
        return False



#
# isValid2:  A function that checks whether a password is secure by
#   testing each required property individually
#
# Parameters:
#   password: string representing a password
#
# Returns:  true if the following conditions are satisfied
#   at least one uppercase char
#   at least one lowercase char
#   at least one numeric digit
#   length >= 7
#
def isValid2(password):
    #
    #  Search for upper case letter
    #
    uppercase = False
    for ch in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
        if (password.find(ch) >= 0):
            uppercase = True

    #
    #  Search for lower case letter
    #
    lowercase = False
    for ch in string.lowercase:         # string.lowercase is a string with all the 
        if (password.find(ch) >= 0):    # lowercase letters in it
            lowercase = True

    #
    #  Search for a digit
    #
    digit = False
    for ch in string.digits:
        if (password.find(ch) >= 0):
            digit = True

    #
    # Password is "secure" if the following properties are satisfied:
    #   at least one uppercase char
    #   at least one lowercase char
    #   at least one numeric digit
    #   at least 7 characters
    #
    if (uppercase == True) and (lowercase == True) and (digit == True) and (len(password) >= 7):
        return True
    else:
        return False