Python读取PNG文件提示bytes类型的对象不可JSON序列化

Question

def base_write_img(self):
    # 1.获取图片文件流
    with open("./image/err.png", "rb") as f:
        # 2.调用allure.attach附加方法
        allure.attach("原因：", f.read(), allure.attachment_type.PNG)

INTERNALERROR>   File "D:\Python\Python39\lib\json\encoder.py", line 179, in default
INTERNALERROR>     raise TypeError(f'Object of type {o.__class__.__name__} '
INTERNALERROR> TypeError: Object of type bytes is not JSON serializable
 

为啥我看视频别人读取没有报错，百度了半天找不到答案，各位大哥救命！！

Answer 1

allure.attach的语法是:allure.attach(body, name, attachment_type, extension),你的代码中前面的两个参数顺序颠倒了。这样改一下试试。

def base_write_img(self):
    # 1.获取图片文件流
    with open("./image/err.png", "rb") as f:
        file=f.read()
        # 2.调用allure.attach附加方法
        allure.attach(file,"原因", allure.attachment_type.PNG)