base64 到 json 属性在 Python

Question

I have the following code:

data = open('/tmp/books_read.png', "rb").read()
    encoded = base64.b64encode(data)
    retObj = {"groupedImage": encoded}
    return func.HttpResponse(
                json.dumps(retObj),
                mimetype="application/json",
                status_code=200)

... and it throws the following error:

Object of type bytes is not JSON serializable Stack

May I know how do I fix this?

Answer 1

If it is image which you want to send as http reponse you shouldn't be doing json.dumps, instead you can send raw bytes and receive it.

However if you still want to do you'll need to change to json.dumps(str(retObj))

Answer 2

base64.b64encode(data) will output an object in bytes

encoded = base64.b64encode(data).decode() converts it to string

after that you might need (quite common) to do url encoding to the string

from urllib.parse import urlencode
urlencode({"groupedImage": encoded})

Answer 3

You should use encoded = base64.b64encode(data).decode()

b64encode() will encode as base64

x.decode() will decode bytes object to unicode string