code: def on_key_release(self, key, modifiers):
      if key == pyglet.window.key.LEFT:
          self.k = max(2, self.k - 1)
          return True
      elif key == pyglet.window.key.RIGHT:
          self.k = self.k + 1
          return True
      return False
  
file_path: geoplotlib/examples/kmeans.py
imports: from geoplotlib.colors import create_set_cmap
  import pyglet
  from sklearn.cluster import KMeans
  import geoplotlib
  from geoplotlib.layers import BaseLayer
  from geoplotlib.core import BatchPainter
  from geoplotlib.utils import BoundingBox
  import numpy
label_desc: Use image node_id 4 for calling the KMeansLayer obj's underlying member method code with example usage: obj.on_key_release(key, modifiers) and returns: False, True, True