docstr: Returns the total number of roots of E_n
docstr_tok: ["Returns","the","total","number","of","roots","of","E_n"]
code: def roots(self):
      """
      Returns the total number of roots of E_n
      """
  
      n = self.n
      if n == 6:
          return 72
      if n == 7:
          return 126
      if n == 8:
          return 240
  
file_path: sympy/sympy/liealgebras/type_e.py
imports: from .cartan_type import Standard_Cartan
  from sympy.core.backend import eye, Rational
label_desc: Use image node_id 6 for calling the TypeE obj's underlying member method code with example usage: obj.roots() and returns: int, int, int