code: def _get_subplot_val_prefix(subplot_type):
      """
      Get the subplot value prefix for a subplot type. For most subplot types
      this is equal to the subplot type string itself. For example, a
      `scatter3d.scene` value of `scene2` is used to associate the scatter3d
      trace with the `layout.scene2` subplot.
  
      However, the `xaxis`/`yaxis` subplot types are exceptions to this pattern.
      For example, a `scatter.xaxis` value of `x2` is used to associate the
      scatter trace with the `layout.xaxis2` subplot.
  
      Parameters
      ----------
      subplot_type: str
          Subplot string value (e.g. 'scene4')
  
      Returns
      -------
      str
      """
      if subplot_type == "xaxis":
          subplot_val_prefix = "x"
      elif subplot_type == "yaxis":
          subplot_val_prefix = "y"
      else:
          subplot_val_prefix = subplot_type
      return subplot_val_prefix
  
file_path: holoviews/holoviews/plotting/plotly/util.py
imports: import copy
  import re
  import numpy
  from plotly import colors
  from ...core.util import isfinite, max_range
  from ..util import color_intervals, process_cmap
label_desc: Use image node_id 2 for calling a global function with example usage: _get_subplot_val_prefix(subplot_type) and returns: subplot_val_prefix