Python速记太多值无法解包错误

我收到错误too many values to unpack (expected 3)。当我添加[]以防它本身是一个元组时，我收到错误not enough values to unpack (expected 3, got 1)该错误在第 50 行上升，r, g, b = hex2rgb(newpix)

我将分享整个代码，因为我不确定这是否是我遇到的唯一错误。

我的目标是在 .png 文件中插入一个字符串。大约 10 年前我曾经使用过 python，我是 C# 用户，所以请原谅我，如果这作为一个问题太nooby

谢谢 PS我不太会表达自己，请随意编辑帖子

from PIL import Image
import binascii
import optparse

def rgb2hex(r, g, b):
    return '#{:02x}{:02x}{:02x}'.format(r, g, b)

def hex2rgb(hexcode):
    return tuple(map(ord, hexcode[1:]))

def str2bin(message):
    binary = bin(int(binascii.hexlify(message.encode()), 16))
    return binary[2:]

def bin2str(binary):
    message = binascii.unhexlify('%x' % (int('0b' + binary, 2)))
    return message

def encode(hexcode, digit):
    if hexcode[-1] in ('0', '1', '2', '3', '4', '5'):
        hexcode = hexcode[:-1] + digit
        return hexcode
    else:
        return None


def decode(hexcode):
    if hexcode[-1] in ('0', '1'):
        return hexcode[-1]
    else:
        return None


def hide(filename, message):
    img = Image.open(filename)
    binary = str2bin(message) + '1111111111111110'
    if img.mode in ('RGBA'):
        img = img.convert('RGBA')
        datas = img.getdata()

        newData = []
        digit = 0
        temp = ''
        for item in datas:
            if (digit < len(binary)):
                newpix = encode(rgb2hex(item[0], item[1], item[2]), binary[digit])
                if newpix == None:
                    newData.append(item)
                else:
                    r, g, b = [hex2rgb(newpix)]
                    newData.append((r, g, b, 255))
                    digit =+ 1
            else:
                newData.append(item)
        img.putdata(newData)
        img.save(filename, "PNG")
        return "Completed!"
    return "Incorrect Image mode, couldn't hide"

def retr(filename):
    img = Image.open(filename)
    binary = ''

    if img.mode in ('RGBA'):
        img = img.convert('RGBA')
        datas = img.getdata()

        for item in datas:
            digit = decode(rgb2hex(item[0], item[1], item[2]))
            if digit == None:
                pass
            else:
                binary = binary + digit
                if (binary[-16:] == '1111111111111110'):
                    print("Success")
                    return bin2str(binary[:-16])
        return bin2str(binary)
    return "Incorrect Image mode, couldn't retrieve"

def Main():
    parser = optparse.OptionParser('usage %prog ' + '-e/-d <target file>')
    parser.add_option('-e', dest = 'hide', type = 'string', help = 'target picture path to hide text')
    parser.add_option('-d', dest = 'retr', type = 'string', help = 'target picture to retrieve text')
    (options, args) = parser.parse_args()
    if (options.hide != None):
        text = input("Enter a message to hide: ")
        print(hide(options.hide, text))
    elif(options.retr != None):
        print(retr(optrions.retr))
    else:
        print(parser.usage)
        exit(0)

if __name__ == '__main__':
    Main()