Python 使用电报机器人返回matplotlib绘图

此代码来自 我正在构建的电报机器人的代码如下：

import pandas as pd
from pandas import datetime
from pandas import DataFrame as df
import matplotlib
from pandas_datareader import data as web
import matplotlib.pyplot as plt
import datetime
import requests 

from bottle import (  
    run, post, response, request as bottle_request
)

BOT_URL = 'https://api.telegram.org/bot128secretns/'  
def get_chat_id(data):  
    """
    Method to extract chat id from telegram request.
    """
    chat_id = data['message']['chat']['id']

    return chat_id

def get_message(data):  
    """
    Method to extract message id from telegram request.
    """
    message_text = data['message']['text']

    return message_text

def send_message(prepared_data):  
    """
    Prepared data should be json which includes at least `chat_id` and `text`
    """ 
    message_url = BOT_URL + 'sendMessage'
    requests.post(message_url, json=prepared_data)   

def get_ticker(text):  
    stock = f'^GSPC'
    start = datetime.date(2000,1,1)
    end = datetime.date.today()
    data = web.DataReader(stock, 'yahoo',start, end)
    plot = data.plot(y='Open') 
    return plot


def prepare_data_for_answer(data):  
    answer = get_ticker(get_message(data))

    json_data = {
        "chat_id": get_chat_id(data),
        "text": answer,
    }

    return json_data

@post('/')
def main():  
    data = bottle_request.json

    answer_data = prepare_data_for_answer(data)
    send_message(answer_data)  # <--- function for sending answer

    return response  # status 200 OK by default

if __name__ == '__main__':  
    run(host='localhost', port=8080, debug=True)

这段代码要做的是从电报应用程序中提取股票代码符号并返回图表

我知道这是因为json不处理图像。 我能做些什么来解决它

TypeError: Object of type AxesSubplot is not JSON serializable