code: def merge_color_and_opacity(color, opacity):
      """
      Merge hex color with an alpha (opacity) to get an rgba tuple.
  
      :param (str|unicode) color: A hex color string.
      :param (float|int) opacity: A value [0, 1] for the 'a' in 'rgba'.
      :return: (int, int, int, float) The rgba color and alpha tuple.
  
      """
      if color is None:  # None can be used as a placeholder, just bail.
          return None
  
      rgb_tup = hex_to_rgb(color)
      if opacity is None:
          return "rgb {}".format(rgb_tup)
  
      rgba_tup = rgb_tup + (opacity,)
      return "rgba {}".format(rgba_tup)
  
imports: import math
  import datetime
  import warnings
  import matplotlib.dates
label_desc: Use image node_id 7 for calling a global function with example usage: merge_color_and_opacity(color, opacity) and returns: str, None, str