input: from typing import List
  
  def crawl(url: str) -> None:
      """ 
      Create a web crawler in Python that starts from a given URL, looks for other links on the page,
      and scrapes the content of the page.
      
      >>> crawl('http://example.com')
      The crawler starts from 'http://example.com', finds and scrapes the content of the page,
      then looks for other links within the page to crawl and scrape.
      
      """
output:     import requests
      from bs4 import BeautifulSoup
      import re
  
      def get_links(url):
          response = requests.get(url)
          soup = BeautifulSoup(response.text, 'html.parser')
          links = set()
          for a_tag in soup.find_all('a', href=True):
              href = a_tag['href']
              if href.startswith('http'):
                  links.add(href)
              elif href.startswith('/'):
                  links.add(url + href)
          return links
  
      def scrape_content(url):
          response = requests.get(url)
          soup = BeautifulSoup(response.text, 'html.parser')
          return soup.get_text()
  
      print(f"The crawler starts from '{url}', finds and scrapes the content of the page,")
      content = scrape_content(url)
      print(f"Scraped content: {content[:100]}...")
      links = get_links(url)
      print(f"Found {len(links)} links to crawl.")
      for link in links:
          print(f"Crawling and scraping content from {link}")
          link_content = scrape_content(link)
          print(f"Scraped content from {link}: {link_content[:100]}...")