Some websites combat crawler by detecting the user agent. User agent can be simply regarded as the name of your browser. Websites may stop your HTTP request if it detects you are not using a normal browser. That is because requests will tell the website its identity by default. You can modify this behaviour using headers parameter of requests.get:
r = requests.get(url, headers = {'user-agent': 'Put-User-Agent-String-Here'})
Use Open Rice as an example:
url = 'https://www.openrice.com/en/hongkong/restaurants?what=sushi'
r = requests.get(url, headers = {'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.167 Safari/537.36'})
A more complete experiment can be found here