code: def __new__(cls, n):
      if n != 2:
          raise ValueError("n should be 2")
      return Standard_Cartan.__new__(cls, "G", 2)
  
file_path: sympy/sympy/liealgebras/type_g.py
imports: from .cartan_type import Standard_Cartan
  from sympy.core.backend import Matrix
label_desc: Use image node_id 1 for calling the TypeG obj's underlying member method code with example usage: obj.__new__(cls, n) and returns: Standard_Cartan