python - 电报机器人返回空

Question

我正在尝试修改此 Webpage 中的代码:
修改后的代码如下:

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/bot------------------/' 


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)  # don't forget to make import requests lib


def get_ticker(text):  # <-- **added this function and removed a function called `def change_text_message(text)`**;
    stock = f'text'
    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

我已经用上下空格分隔了我修改过的代码。此时我收到一条短信 null , 我该如何解决这个问题，以便当我输入股票代码时，它会返回股票代码的图表？我不确定图表是否可以返回，或者是否可以将唯一的文本发送回去。如果单独运行，添加的功能确实可以工作，但不能在这里运行。

Answer 1

也许我不明白什么，但主要原因是你的函数( get_ticker )没有返回任何东西。

看着:
answer_data = prepare_data_for_answer(data) . prepare_data_for_answer的结果:

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

好的。什么是 answer ?是 get_ticker 的结果(见 answer = get_ticker(get_message(data)))。

好的。但是 get_ticker的结果是什么？ ?我没看到 return声明...所以结果总是 None (json null)。这就像:

def get_message():
    msg = 'hello'
message = get_message()  # None. Always None(or null in json)

希望这可以帮助。