code: def create_bodies(self):
          '''Create physics bodies corresponding to each marker in our data.'''
          self.bodies = {}
          for label in self.channels:
              body = self.world.create_body(
                  'sphere', name='marker:{}'.format(label), radius=0.02)
              body.is_kinematic = True
              body.color = 0.9, 0.1, 0.1, 0.5
              self.bodies[label] = bodf create_bodies(self):
          '''Create physics bodies corresponding to each marker in our data.'''
          self.bodies = {}
          for label in self.channels:
              body = self.world.create_body(
                  'sphere', name='marker:{}'.format(label), radius=0.02)
              body.is_kinematic = True
              body.color = 0.9, 0.1, 0.1, 0.5
              self.bodies[label] = body
docs: Create physics bodies corresponding to each marker in our data.