继承人一些异步代码为亚马逊搜索提供硒队列，为啥我得到 AttributeError？ __init__ 没有运行？

Posted 2023-02-23

【中文标题】继承人一些异步代码为亚马逊搜索提供硒队列，为啥我得到 AttributeError？ __init__ 没有运行？

【英文标题】：Heres some async code to provide a queue for amazon searches with selenium, why am i getting AttributeError? The __init__ is not running?继承人一些异步代码为亚马逊搜索提供硒队列，为什么我得到 AttributeError？ __init__ 没有运行？

【发布时间】：2022-01-02 13:33:25

【问题描述】：

这是我用来从我的 tornado 网络应用程序中搜索亚马逊的代码。目前我只实例化了其中一个类（和一个 webdriver）。我将来可能想要一个池（是的，我知道有硒网格，但这不是我的问题。）我的问题是，为什么 __init__ 显然没有运行？为什么访问在__init__中明确定义的self.queue var会出现attributeError？

import asyncio
import uuid
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support.expected_conditions import presence_of_element_located
from selenium.common.exceptions import NoSuchElementException


class Searcher:
    def __init___(self):
        self.driver = webdriver.Firefox(executable_path="/home/felix/project/geckodriver")
        self.wait = WebDriverWait(self.driver, 10)
        self.driver.get("https://amazon.com/")
        self.queue = []

    async def _search(self, query):
        self.driver.find_element(By.ID, "twotabsearchtextbox").send_keys("pixel" + Keys.RETURN)
        self.wait.until(presence_of_element_located((By.XPATH,
                "//div[contains(@class, 'sg-col-inner')]/div[contains(@class, 'a-section')]"
                "/div[contains(@class, 'a-section')]")))
        el = self.driver.find_elements(By.XPATH,
                "//div[contains(@class, 'a-section')]/div[h2][not(contains(.,'Sponsored'))]"
                "[contains(@class, 'a-section')]/..")
        out=[]
        for e in range(len(el)):
            try:
                out+=["price": el[e].find_element(By.XPATH, ".//span[contains(@class, 'a-price-whole')]").text + "." +
                el[e].find_element(By.XPATH, ".//span[contains(@class, 'a-price-fraction')]").text,
                "title": el[e].find_element(By.XPATH, ".//h2").text]
            except NoSuchElementException:
                pass
        return out

    def search(self, query):
        _id = uuid.uuid4()
        self.queue.append(_id)
        async def help(self):
            while 1:
                if _id == self.queue[0]:
                    return await self._search(query)
                await asyncio.sleep(0.5)
        res = help(self)
        self.queue.pop()
        return res

a = Searcher()
print(asyncio.run(a.search("test")))

这是错误：

Traceback (most recent call last):
  File "/home/felix/project/search.py", line 49, in <module>
    print(asyncio.run(a.search("test")))
  File "/home/felix/project/search.py", line 38, in search
    self.queue.append(_id)
AttributeError: 'Searcher' object has no attribute 'queue'

【问题讨论】：

无论如何，最好避免将执行 IO 的复杂代码放在 __init__ 中。

我不确定你指的是什么代码，或者你为什么不指？

【参考方案1】：

多么荒谬……我已将 __init__ 函数命名为 __init___。

我已经修复了重构的其他错误，这是工作代码

import asyncio
import uuid
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support.expected_conditions import presence_of_element_located
from selenium.common.exceptions import NoSuchElementException


class Searcher:
    def __init__(self):
        self.driver = webdriver.Firefox(executable_path="/home/felix/amcoin/geckodriver")
        self.wait = WebDriverWait(self.driver, 10)
        self.driver.get("https://amazon.com/")
        self.queue = []

    async def _search(self, query):
        self.driver.find_element(By.ID, "twotabsearchtextbox").send_keys(query + Keys.RETURN)
        self.wait.until(presence_of_element_located((By.XPATH,
                "//div[contains(@class, 'sg-col-inner')]/div[contains(@class, 'a-section')]"
                "/div[contains(@class, 'a-section')]")))
        el = self.driver.find_elements(By.XPATH,
                "//div[contains(@class, 'a-section')]/div[h2][not(contains(.,'Sponsored'))]"
                "[contains(@class, 'a-section')]/..")
        out=[]
        for e in range(len(el)):
            try:
                out+=["price": el[e].find_element(By.XPATH, ".//span[contains(@class, 'a-price-whole')]").text + "." +
                el[e].find_element(By.XPATH, ".//span[contains(@class, 'a-price-fraction')]").text,
                "title": el[e].find_element(By.XPATH, ".//h2").text]
            except NoSuchElementException:
                pass
        return out

    async def search(self, query):
        _id = uuid.uuid4()
        self.queue.append(_id)
        while 1:
            if _id == self.queue[0]:
                res = await self._search(query)
                self.queue.pop()
                return res
            await asyncio.sleep(0.5)

a = Searcher()
print(asyncio.run(a.search("test")))