Telegram股票机器人报TypeError：‘in <string>’需字符串左操作数

问题场景 #

开发Telegram股票机器人时，通过yfinance API获取雅虎财经股票价格，运行代码触发TypeError错误，错误位于stock_request函数的判断语句处。

错误信息 #

File "c:\Users\USER\Desktop\Python\Telegram Bot\Stocks bot2\main.py", line 47, in stock_request   
    if len(request) < 2 or request[0].lower not in 'price':
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'in <string>' requires string as left operand, not builtin_function_or_method

原始代码 #

import os
import telebot
from dotenv import load_dotenv
import yfinance as yf

load_dotenv()
API_KEY = os.getenv('API_KEY')
bot = telebot.TeleBot(API_KEY)

@bot.message_handler(commands=['Greet'])
def greet(message):
    bot.reply_to(message, "Hello! How are you?")

@bot.message_handler(commands=['hello'])
def hello(message):
    bot.send_message(message.chat.id, "Hello!")

@bot.message_handler(commands=['wsb'])
def get_stocks(message):
    response = ""
    stocks = ['tsla', 'sq', 'pltr']
    stock_data = []
    for stock in stocks:
        data = yf.download(tickers=stock, period='2d', interval='1d')
        data = data.reset_index()
        response += f"-----{stock}\-----\n"
        stock_data.append([stock])
        columns = ['stock']
        for index, row in data.iterrows():
            stock_position = len(stock_data) - 1
            price = round(row['Close'], 2)
            format_date = row['Date'].strftime('%m/%d')
            response += f"{format_date}: {price}\n"
            stock_data[stock_position].append(price)
            columns.append(format_date)
        print()
    
    response = f"{columns[0] : <10}{columns[1] : ^10}{columns[2] : >10}\n"
    for row in stock_data:
        response += f"{row[0] : <10}{row[1] : ^10}{row[2] : >10}\n"
    response += "\nStock Data"
    print(response)
    bot.send_message(message.chat.id, response)

def stock_request(message):
    request = message.text.split()
    if len(request) < 2 or request[0].lower not in 'price':
        return False
    else:
        return True

@bot.message_handler(func=stock_request)
def send_price(message):
    request = message.text.split()[1]
    data = yf.download(tickers=request, period= '5m', interval='1m')
    if data.size > 0:
        data = data.reset_index()
        data["format_date"] = data['Datetime'].dt.strftime('%m/%d %I:%M %p')
        data.set_index('format_date', inplace=True)
        print(data.to_string())
        bot.send_message(message.chat.id, data['Close'].to_string(header=False))
    else:
        bot.send_message(message.chat.id, "No Data!?")

bot.polling()

用户尝试的无效修改 #

曾尝试将判断语句改为if 'price' not in len(request) < 2 or request[0].lower :，问题未解决。

修复方案 #

错误原因 #

1. request[0].lower未加括号，此时是字符串的lower方法对象，而非执行方法后得到的小写字符串，导致无法用in进行字符串判断。
2. 原逻辑错误：request[0].lower() not in 'price'是检查字符串是否为'price'中的单个字符，而非判断是否等于完整的'price'。

修改后的stock_request函数 #

def stock_request(message):
    request = message.text.split()
    if len(request) < 2 or request[0].lower() != 'price':
        return False
    else:
        return True

解释 #

• 添加括号调用lower()方法，获取小写后的字符串，解决TypeError问题。
• 用!= 'price'替代not in 'price'，符合业务逻辑：判断用户输入的第一个词是否为完整的'price'（如用户输入price TSLA触发查询）。

内容的提问来源于stack exchange，提问作者Lehends01