表未正确刮擦 python BeautifulSoup

Question

I have the following code which is trying to scrape the main table on this page. I need to get the NORAD ID and Launch date the 2nd and 4th columns. However I can't get BeutifulSoup to find the table by going of its ID.

import requests
from bs4 import BeautifulSoup

data = []

URL = 'https://www.n2yo.com/satellites/?c=52&srt=2&dir=1'
page = requests.get(URL)
soup = BeautifulSoup(page.content, 'html.parser')

table = soup.find("table", id="categoriestab")
rows = table.find_all('tr')

for row in rows:
    cols = row.find_all('td')
    cols = [ele.text.strip() for ele in cols]
    data.append([ele for ele in cols if ele]) # Get rid of empty values

print(data)

Answer 1

For getting NORAD ID and Launch date , You can try it:

import pandas as pd

url = "https://www.n2yo.com/satellites/?c=52&srt=2&dir=0"
df = pd.read_html(url)

data = df[2].drop(["Name", "Int'l Code", "Period[minutes]", "Action"], axis=1)
print(data)

Output will be:

Answer 2

Change

soup = BeautifulSoup(page.content, 'html.parser')

to

soup = BeautifulSoup(page.content, 'lxml')

Answer 3

If you print the soup and do a search you will not find the id you are looking for in the output. This most likely means this page is JavaScript rendered. You can look into using PhantomJS or selenium. I used selenium to solve a problem like this that I ran into. You will need to download chrome driver: https://chromedriver.chromium.org/downloads . Here is the code that I used.

driver = webdriver.Chrome(executable_path=<YOUR PATH>, options=options)
driver.get('YOUR URL')
driver.implicitly_wait(1)
soup_file = BeautifulSoup(driver.page_source, 'html.parser')

What this does is sets up the driver to connect to the url, waits until its loaded, grabs all the code and puts it into the BeautifulSoup object.

Hope this helps!