跳过错误并在循环中获取3个错误后继续运行 - 从Pandas获取价格数据

Question

我创建了一个循环来迭代函数。该功能只是通过一系列代码从雅虎财经获取数据。但是，有些代码在雅虎财务中没有数据，有时会有错误，所以我需要在出现此错误时重新运行该函数。

基本上，重新运行可以解决这个错误，但是如果数据库中没有数据，它也无能为力。所以，我想使用一个循环定义，如果有错误，然后重新运行，但是如果该错误出现错误3次，则跳过该错误。

我认为我在循环中做了一些错误，它没有通过那个报价器，并且它保持重新运行，即使它已经超过了3次错误。我可以知道我该如何解决它？

谢谢！

from selenium import webdriver 
from selenium.webdriver.common.by import By 
from selenium.webdriver.support.ui import WebDriverWait 
from selenium.webdriver.support import expected_conditions as EC 
import pickle 
import datetime as dt 
import os 
import pandas as pd 
import pandas_datareader.data as web 

def save_hsci_tickers(): 
    driver = webdriver.Chrome(r"C:/Users/kman/Downloads/chromedriver_win32/chromedriver.exe") 
    wait = WebDriverWait(driver, 10) 
    driver.get("https://www.hsi.com.hk/HSI-Net/HSI-Net?cmd=tab&pageId=en.indexes.hscis.hsci.constituents&expire=false&lang=en&tabs.current=en.indexes.hscis.hsci.overview_des%5Een.indexes.hscis.hsci.constituents&retry=false") 
    tickers = [] 
    for name in wait.until(EC.presence_of_all_elements_located((By.CSS_SELECTOR, "table.greygeneraltxt td.greygeneraltxt,td.lightbluebg"))): 
     data = str(name.get_attribute('textContent')) 
     tickers.append(data) 
    edit = [x for x in tickers if x != ''] 
    final = edit[::2] 
    driver.quit() 

    def yahoo_ticker(data): 
     if len(data) <= 4: 
      return data.zfill(4) + '.HK' 
     else: 
      return data[0:] + '.HK' 
    yahoo_tickers = [yahoo_ticker(data) for data in final] 
    with open("hscitickers.pickle","wb") as f: 
     pickle.dump(yahoo_tickers, f) 

    print(yahoo_tickers) 
    return yahoo_tickers 

save_hsci_tickers() 

def get_data_from_yahoo (reload_hscitickers=False): 
    if reload_hscitickers: 
     tickers = save_hsci_tickers() 
    else: 
     with open("hscitickers.pickle","rb") as f: 
      tickers = pickle.load(f) 

    if not os.path.exists('stock_dfs'): 
     os.makedirs('stock_dfs') 

    start = dt.datetime(2009,6,30) 
    end = dt.datetime(2017,6,30) 

    for ticker in tickers: 
     print(ticker) 
     if not os.path.exists('stock_dfs/{}.csv'.format(ticker)): 
      df =web.DataReader(ticker,'yahoo',start,end) 
      df.to_csv('stock_dfs/{}.csv'.format(ticker)) 
     else: 
      print('Already have {}'.format(ticker)) 

attempts = 0 
while True: 
    try: 
     get_data_from_yahoo() 
    except: 
     if attempts < 3: 
      attempts += 1 
      continue 
     if attempts >= 3: 
      pass 
    else: 
     break 

Answer 1

您必须在while循环外定义变量尝试才能使其工作。