python字节流怎么转化成图片

import base64

# 图片转字节

def tu_zi_jie():

    with open('jiu.png','rb') as fp:

        tu = base64.b64encode(fp.read())

    # 生成很长得一串字节流

    print(tu)

if __name__ == '__main__':

    tu_zi_jie()

import base64

# 字节转图片

def zi_tu():

    # 这个就是把上面打印的字节流那过来进行转换图片

    # 因为转换后字符串很长所以我截取了一部分

    b_tu = b'iVBORw0KGgoAAAANS....UhEU'

    tu_b = base64.b64decode(b_tu)

    with open('tu.png', 'wb') as fp:

        fp.write(tu_b)

if __name__ == '__main__':

    tu_zi_jie()