'NoneType' object has no attribute 'start'
时间: 2023-10-14 14:07:01 浏览: 256
This error message is indicating that you are trying to access the 'start' attribute of an object of type 'NoneType'. This typically means that the object you are working with is None, or it was not properly initialized with the 'start' attribute.
To resolve this error, you can check if the object is None before accessing its attributes. You may also need to review your code to ensure that you are properly initializing objects and assigning values to their attributes.
相关问题
'NoneType' object has no attribute 'QTimer'
'NoneType' object has no attribute 'QTimer'错误通常发生在使用Qtimer对象时,而该对象为空值(NoneType)时。这种错误通常是由于没有正确初始化或创建Qtimer对象导致的。
要解决这个问题,你可以检查以下几点:
1. 确保你正确地创建了Qtimer对象并将其赋值给一个变量。例如,你可以使用以下代码创建一个Qtimer对象:
QTimer *timer = new QTimer(this);
2. 确保你在使用Qtimer对象之前正确地初始化它。你可以使用以下代码初始化Qtimer对象:
timer->start(1000); // 以毫秒为单位设置定时器的间隔
3. 检查你的代码,确保你没有在使用Qtimer对象之前将其赋值为空值(NoneType)。你可以使用以下代码进行检查:
if timer is None:
print("QTimer对象为空")
else:
# 在这里使用Qtimer对象
4. 如果你使用的是Python的Qt库(PyQt或PySide),请确保你正确地导入了Qtimer类。例如,你可以使用以下代码导入Qtimer类:
from PyQt5.QtCore import QTimer
通过检查以上几点,你应该能够找到引发'NoneType' object has no attribute 'QTimer'错误的原因,并找到相应的解决方法。
python 'NoneType' object has no attribute 'find'
这个错误是因为在你的代码中,变量 `bs` 是一个 NoneType 对象,而不是一个 BeautifulSoup 对象。因此,无法调用 `find` 或 `find_all` 方法。这个问题通常是由于加载网页过快,导致网页内容没有被完全加载而引起的。你可以通过添加延时或者设置超时时间来解决这个问题。在你的代码中,你可以尝试使用 `time.sleep()` 函数来添加延时,或者在请求中设置 `timeout` 参数来等待页面加载完全。例如:
```python
import time
import requests
from bs4 import BeautifulSoup
url = 'https://movie.douban.com/top250?start=0&filter='
res = requests.get(url, headers=self.headers, timeout=5)
time.sleep(5) # 添加延时等待页面加载完全
html = res.text
soup = BeautifulSoup(html,'html.parser')
bs = soup.find('ol', class_='grid_view')
numbers = bs.find_all('li')
print(type(numbers))
```
这样做可以确保页面完全加载后再进行解析,避免了 'NoneType' object has no attribute 'find' 的错误。<em>1</em><em>2</em><em>3</em>
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