class_docstr: A mixin class to map scalar data to RGBA.
  
  The ScalarMappable applies data normalization before returning RGBA colors
  from the given colormap.
docstr: Returns
  -------
  float
      Always returns 1.
docstr_tok: ["Returns","--","--","--","-","float","Always","returns","1","."]
code: def get_alpha(self):
      """
      Returns
      -------
      float
          Always returns 1.
      """
      # This method is intended to be overridden by Artist sub-classes
      return 1.0
  
imports: from collections.abc import Mapping
  import functools
  import numpy
  from numpy import ma
  import matplotlib
  from matplotlib import _api, colors, cbook, scale
  from matplotlib._cm import datad
  from matplotlib._cm_listed import cmaps
label_desc: Use image node_id 9 for calling the ScalarMappable obj's underlying member method code with example usage: obj.get_alpha() and returns: int