如何解决“类的未解析属性引用”
[英]How to solve "Unresolved attribute reference for class"
问题描述
我一直在做一个小项目，它是一个网络爬虫模板。 我在 pycharm 中遇到问题，我收到警告Unresolved attribute reference 'domain' for class 'Scraper'
from abc import abstractmethod
import requests
import tldextract
class Scraper:
scrapers = {}
def __init_subclass__(scraper_class):
Scraper.scrapers[scraper_class.domain] = scraper_class # Unresolved attribute reference 'domain' for class 'Scraper'
@classmethod
def for_url(cls, url):
k = tldextract.extract(url)
# Returns -> <scraper.SydsvenskanScraper object at 0x000001E94F135850> & Scraped BBC News<!DOCTYPE html><html Which type annotiation?
return cls.scrapers[k.registered_domain](url)
@abstractmethod
def scrape(self):
pass
class BBCScraper(Scraper):
domain = 'bbc.co.uk'
def __init__(self, url):
self.url = url
def scrape(self):
rep = requests.Response = requests.get(self.url)
return "Scraped BBC News" + rep.text[:20] # ALL HTML CONTENT
class SydsvenskanScraper(Scraper):
domain = 'sydsvenskan.se'
def __init__(self, url):
self.url = url
def scrape(self):
rep = requests.Response = requests.get(self.url)
return "Scraped Sydsvenskan News" + rep.text[:20] # ALL HTML CONTENT
if __name__ == "__main__":
URLS = ['https://www.sydsvenskan.se/', 'https://www.bbc.co.uk/']
for urls in URLS:
get_product = Scraper.for_url(urls)
r = get_product.scrape()
print(r)
当然我可以忽略它，因为它正在工作，但我不想忽略警告，因为我相信 pycharm 很聪明，应该解决警告而不是忽略它，我想知道它警告我的原因是什么？
3 个解决方案
解决方案1
2 已采纳 2021-05-24 17:46:49
关于如何删除此警告有几个不同的级别：
- 分配一个默认值：
class Scraper:
scrapers = {}
domain = None # Or a sensible value of one exists
- 您可以另外或交替注释类型。
from typing import ClassVar
class Scraper:
scrapers: ClassVar[dict[str, 'Scraper']] = {}
domain: ClassVar[str]
请注意， ClassVar是必需的，否则假定它们是实例属性。
解决方案2
1 2022-04-05 01:08:39
要忽略它，请放
# noinspection PyUnresolvedReferences
在导致警告的行上方的行上。
解决方案3
0 2021-05-24 17:45:21
告诉你的Scraper class 这个属性存在
class Scraper:
scrapers = {}
domain: str
def __init_subclass__(scraper_class):
Scraper.scrapers[scraper_class.domain] = scraper_class
类“VideoFileClip”的未解决的属性引用“resize”
[英]Unresolved attribute reference 'resize' for class 'VideoFileClip'
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