使用stock_basic从tushare获取股票数据，从中提取股票代码，用此股票代码下载股票交易数据，打印总股票数量，下载花费时间，使用两个线程来下载，用threading.Thread模块，发送两个信号股票的总共的下载进度，下载进度是整数百分比，创建一个这样的类

以下是一个实现你所说功能的类：

import threading
import time
import tushare as ts

class StockDownloader:
    def __init__(self, start_date, end_date):
        self.start_date = start_date
        self.end_date = end_date
        self.stock_codes = []
        self.total_stock_num = 0
        self.downloaded_stock_num = 0
        self.progress1 = 0
        self.progress2 = 0
        self.lock = threading.Lock()

    def get_stock_codes(self):
        df = ts.get_stock_basics()
        self.stock_codes = list(df.index)
        self.total_stock_num = len(self.stock_codes)

    def download_stock_data(self, start, end, thread_num):
        for i in range(start, end):
            code = self.stock_codes[i]
            df = ts.get_hist_data(code, start=self.start_date, end=self.end_date)
            with self.lock:
                self.downloaded_stock_num += 1
                if thread_num == 1:
                    self.progress1 = self.downloaded_stock_num / self.total_stock_num * 100
                else:
                    self.progress2 = self.downloaded_stock_num / self.total_stock_num * 100

    def download_stock_data_with_threads(self):
        self.get_stock_codes()
        mid = self.total_stock_num // 2

        thread1 = threading.Thread(target=self.download_stock_data, args=(0, mid, 1))
        thread2 = threading.Thread(target=self.download_stock_data, args=(mid, self.total_stock_num, 2))

        start_time = time.time()

        thread1.start()
        thread2.start()

        while thread1.is_alive() or thread2.is_alive():
            time.sleep(1)
            print(f"Progress 1: {round(self.progress1, 2)}%")
            print(f"Progress 2: {round(self.progress2, 2)}%")

        end_time = time.time()

        print(f"Total downloaded stock num: {self.downloaded_stock_num}")
        print(f"Time used: {end_time - start_time} seconds")

这个类有以下几个方法：

- `__init__`: 初始化，接收下载的起止日期。
- `get_stock_codes`: 从tushare中获取所有股票代码，计算股票总数。
- `download_stock_data`: 下载指定股票代码的交易数据，更新已下载股票总数和下载进度。
- `download_stock_data_with_threads`: 使用两个线程来下载股票数据，输出下载进度和花费时间。

使用示例：

downloader = StockDownloader("2021-01-01", "2021-05-31")
downloader.download_stock_data_with_threads()