一旦条件相同的循环完成第一次迭代，尝试从一开始就重新开始迭代循环答案

【问题标题】：Trying to restart iterating a loop from the very beginning once condition the same loop finished first iteration一旦条件相同的循环完成第一次迭代，尝试从一开始就重新开始迭代循环
【发布时间】：2023-04-01 12:40:01
【问题描述】：

我有 2 个嵌套的“for 循环”，我正在尝试重新启动第一个循环以从头开始迭代，一旦它的嵌套循环完成，它就会按照 if 语句成功迭代。但是，如果嵌套循环满足“else”条件，则外部循环应该定期继续它的迭代。我试图告诉代码，如果找到的keywords_on_screen 以创建的关键字开始直到该点继续运行，否则在他们停止匹配的最后一个索引处更改后者。

这是我已经尝试过的，但是第一个（外）循环继续遍历字母，而不是从头开始。

import time
from bs4 import BeautifulSoup
from selenium import webdriver
browser = webdriver.Chrome('chromedriver.exe')
keyList = ['a','b','c','d']
mainUrl = "https://www.amazon.com/"
browser.get(mainUrl)
searchInput = browser.find_element_by_xpath('//input[@id="twotabsearchtextbox"]')
searchInput.clear()
keyword = str()

# I WANT THE LOOP TO RESTART FROM HERE ONCE THE NESTED LOOP IS FINISHED

for keyChar in keyList:
    searchInput.send_keys(keyChar)
    time.sleep(2)
    searchSoup = BeautifulSoup(browser.page_source, "html.parser")
    searchResult = searchSoup.find_all('div', attrs={'id':'suggestions-template'})
    results = searchResult[0].find_all('div', attrs={'class':'s-suggestion'})
    keyword = keyword + keyChar
    print("This is the keyword so far:>>>>   ",keyword)
    time.sleep(2)

    for data_result in results:
        data_keywords = BeautifulSoup(str(data_result),"html.parser")
        keywords_on_screen = data_keywords.find("div", class_="s-suggestion")["data-keyword"]
        print(keywords_on_screen)

        if keywords_on_screen.startswith(keyword):
            print('ALL GOOD')
        else:
            print('Condition not met, moving on next letter')
            continue

【问题讨论】：

标签： python-3.x loops for-loop

【解决方案1】：

如果嵌套循环中的else 条件得到满足，我相信您想要的是继续最外层的循环。如果不满足else 条件，则从头开始重新启动最外层循环。

试试：-

import time
from bs4 import BeautifulSoup
from selenium import webdriver
browser = webdriver.Chrome('chromedriver.exe')
keyList = ['a','b','c','d']
mainUrl = "https://www.amazon.com/"
browser.get(mainUrl)
searchInput = browser.find_element_by_xpath('//input[@id="twotabsearchtextbox"]')
searchInput.clear()
keyword = str()
ctr = 0
x = 0

# I WANT THE LOOP TO RESTART FROM HERE ONCE THE NESTED LOOP IS FINISHED

while x < len(keyList):
    keyChar = keyList[x]
    searchInput.send_keys(keyChar)
    time.sleep(2)
    searchSoup = BeautifulSoup(browser.page_source, "html.parser")
    searchResult = searchSoup.find_all('div', attrs={'id':'suggestions-template'})
    results = searchResult[0].find_all('div', attrs={'class':'s-suggestion'})
    keyword = keyword + keyChar
    print("This is the keyword so far:>>>>   ",keyword)
    time.sleep(2)

    for data_result in results:
        data_keywords = BeautifulSoup(str(data_result),"html.parser")
        keywords_on_screen = data_keywords.find("div", class_="s-suggestion")["data-keyword"]
        print(keywords_on_screen)

        if keywords_on_screen.startswith(keyword):
            print('ALL GOOD')
            ctr = 1
        else:
            print('Condition not met, moving on next letter')
            ctr = 0
            continue
    if ctr is not 1:
        x += 1

最外层循环将无限执行，直到满足嵌套的if 条件，否则如果条件不满足，则最外层循环将正常执行，并在列表KeyList 的所有元素耗尽时终止。

【讨论】：