Can only find by id, not by class, with BeautidulSoup4 (Python3.x)
Below are the commands i run and it works great for me
In [1]: from bs4 import BeautifulSoupIn [2]: import requestsIn [3]: res = requests.get("http://www.spotrac.com/mlb/atlanta-braves/freddie-freeman-7359/")In [4]: soup = BeautifulSoup(res.text,"lxml")In [5]: len(soup.findAll('div', {'class': 'main-container'}))Out[5]: 1In [6]: soup = BeautifulSoup(res.text,"html5lib")In [7]: len(soup.findAll('div', {'class': 'main-container'}))Out[7]: 1In [8]: import sys; sys.versionOut[8]: '3.6.2 (default, Jul 17 2017, 16:44:45) \n[GCC 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.42)]'As you can see it works for me in both parsers.