Python“NoneType”对象没有属性“__getitem__”

Question

我有这个错误：

>C:\Python27\python.exe ShodanHostSeeker.py
Made by Zaseth.
Your target IP: 19290334
Traceback (most recent call last):
  File "ShodanHostSeeker.py", line 12, in <module>
    openPorts = soup.find("meta", attrs={"name": "twitter:description"})["content"]
TypeError: 'NoneType' object has no attribute '__getitem__'

我正在使用Python 2.7。 我的代码：

from bs4 import BeautifulSoup
import requests
s = requests.Session()

print("Made by Zaseth.")
shodanURL = input("Your target IP: ")

r = s.get('https://www.shodan.io/host/' + str(shodanURL))
soup = BeautifulSoup(r.text, "html.parser")

openPorts = soup.find("meta", attrs={"name": "twitter:description"})["content"]
print(openPorts)

tableElements = [element.contents[0] for element in soup.find("table", attrs={"class": "table"}).findAll("td")]
print(tableElements)

tableContents = [element.contents[0] for element in soup.find("table", attrs={"class": "table"}).findAll("th")]
print(tableContents)

有谁知道为什么会这样？ 我真的迷路了，我已经用Google搜索过了。