old_contents: from math import pi
  
  import gmsh
  
  
  class Cone:
      """
      Creates a cone.
  
      center : array-like[3]
          The 3 coordinates of the center of the first circular face.
      axis : array-like[3]
          The 3 components of the vector defining its axis.
      radius0 : float
          Radius of the first circle.
      radius1 : float
          Radius of the second circle.
      angle : float
          Angular opening of the the Cone.
      """
  
      dim = 3
  
      def __init__(self, center, axis, radius0, radius1, angle=2 * pi):
          assert len(center) == 3
          assert len(axis) == 3
  
          self.center = center
          self.axis = axis
          self.radius0 = radius0
          self.radius1 = radius1
  
          self._ID = gmsh.model.occ.addCone(*center, *axis, radius0, radius1, angle=angle)
          self.dim_tags = [(3, self._ID)]
  
      def __repr__(self):
          return f"<pygmsh Cone object, ID {self._ID}>"
  
new_contents: from math import pi
  
  import gmsh
  
  
  class Cone:
      """
      Creates a cone.
  
      center : array-like[3]
          The 3 coordinates of the center of the first circular face.
      axis : array-like[3]
          The 3 components of the vector defining its axis.
      radius0 : float
          Radius of the first circle.
      radius1 : float
          Radius of the second circle.
      angle : float
          Angular opening of the the Cone.
      """
  
      dim = 3
  
      def __init__(self, center, axis, radius0, radius1, angle=2 * pi):
          assert len(center) == 3
          assert len(axis) == 3
  
          self.center = center
          self.axis = axis
          self.radius0 = radius0
          self.radius1 = radius1
  
          self._ID = gmsh.model.occ.addCone(*center, *axis, radius0, radius1, angle=angle)
          self.dim_tag = (3, self._ID)
          self.dim_tags = [(3, self._ID)]
  
      def __repr__(self):
          return f"<pygmsh Cone object, ID {self._ID}>"
  
subject: add dim_tag to the Cone class