Calculates the password to change the time in Pokemon GSC

PKMN_GSC_TIME

# Derived from http://www.pokezam.com/games/gameboy/gold/tc.js
# Usage: either import gen_pkmn_timecode or run directly
# NOTE: Pk is represented by + and Mn is represented by =
# e.g. if name is Kyle(Pk)(Mn) then type Kyle+=
#
# To access password screen (Source: Bulbapedia):
# G/S: Hold Down, Select, and B
# Crystal: Hold Down, Select, and B
#          Release Down and B while still holding Select
#          Press Left and Up while still holding Select
#          Release Select while still holding Up and Left.
def gen_pkmn_timecode(name, cash, train_id):
    new_cash = cash % 65535
    new_id = train_id % 65535

    final_cash = new_cash // 256 + new_cash % 256
    final_id = new_id // 256 + new_id % 256

    nval = 0
    counter = 0

    for char in name:
        if counter >= 5:
            break
        else:
            counter += 1
        nval += get_name_value(char)

    return nval + final_cash + final_id

def get_name_value(char):
    charcode = ord(char)

    if char >= 'A' and char <= 'Z':
        return (charcode - ord('A')) + 128
    elif char >= 'a' and char <= 'z':
        return charcode - ord('a') + 160
    else:
        if char == '-':
            return 227
        elif char == '?':
            return 230
        elif char == '/':
            return 243
        elif char == '.':
            return 232
        elif char == ',':
            return 244
        elif char == '(':
            return 154
        elif char == ')':
            return 155
        elif char == ':':
            return 156
        elif char == ';':
            return 157
        elif char == '[':
            return 158
        elif char == ']':
            return 159
        elif char == '+': # PK
            return 225
        elif char == '=': # MN
            return 226
        elif char == '!':
            return 231
        elif char == '*':
            return 241
        else:
            raise ValueError

if __name__ == "__main__":
    name = input("Name: ")
    cash = int(input("Cash on hand: "))
    trainer_id = int(input("Trainer ID: "))

    passwd = gen_pkmn_timecode(name, cash, trainer_id)
    str_passwd = str(passwd)
    while len(str_passwd) < 5:
        str_passwd = '0' + str_passwd

    print()
    print("Password:", str_passwd)