Python 网络抓取的 while 循环错误，相同数据出现 5 次

Question

在加入while循环之前，输出将输出所有100家公司的数据。所以我创建了一个 while 循环来只显示前五家公司。然而现在它只显示第一家公司五次。有什么帮助吗？提前致谢！

    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
    
    driver = webdriver.Chrome(executable_path='C:\Program Files (x86)\chromedriver.exe')
    driver.get("https://www.tradingview.com/markets/stocks-usa/market-movers-active/")
    
    class most_active_stock():
        def __init__(self):
            main = WebDriverWait(driver, 10).until(
                EC.visibility_of_all_elements_located((By.CSS_SELECTOR, ".tv-data-table__tbody .tv-data-table__row.tv-data-table__stroke.tv-screener-table__result-row")))
            self.companies = driver.find_elements_by_css_selector(".tv-data-table__tbody .tv-data-table__row.tv-data-table__stroke.tv-screener-table__result-row")
            self.result = []
            self.index = 0
    
        def getdata(self):
            for company in self.companies:
                name_short = company.find_element_by_css_selector(".tv-screener__symbol.apply-common-tooltip").text
                name_long = company.find_element_by_css_selector(".tv-screener__description").text
                last = company.find_element_by_css_selector(".tv-data-table__cell.tv-screener-table__cell.tv-screener-table__cell--big.tv-screener-table__cell--with-marker:nth-of-type(2)>span").text
                self.result.append([name_short, name_long, last])
    
        def printdata(self):
            print("MOST ACTIVE STOCKS:", sep='\n')
            for p in self.result:
                while self.index < 5:
                    print(p, sep='\n')
                    self.index += 1
    
    activeStock = most_active_stock()
    
    if __name__ == "__main__":
        activeStock.getdata()
        activeStock.printdata()

    #Output:
    #MOST ACTIVE STOCKS:
    #['GERN', 'GERON CORPORATION', '1.83']
    #['GERN', 'GERON CORPORATION', '1.83']
    #['GERN', 'GERON CORPORATION', '1.83']
    #['GERN', 'GERON CORPORATION', '1.83']
    #['GERN', 'GERON CORPORATION', '1.83']

Answer 1

我认为问题出在这部分代码中：

def printdata(self):
    print("MOST ACTIVE STOCKS:", sep='\n')
    for p in self.result:
        while self.index < 5:
            print(p, sep='\n')
            self.index += 1

因此内部 while 循环执行直到 self.index 等于 5，并且在此过程中它打印相同的 'p' 5 次。

根据您组织数据的方式（在 self.result 中看起来是以列表的形式），您可能会这样做：

def printdata(self):
    print("MOST ACTIVE STOCKS:", sep='\n')
    while self.index < 5:
        print(self.result[self.index], sep='\n')
        self.index += 1

Python 网络抓取的 while 循环错误，相同数据出现 5 次

Python while loop error with web scraping, same data appearing 5x times

python

loops

while-loop

web-scraping