code: def close(key):
      """Closes and unregister the context figure corresponding to the key.
  
      Parameters
      ----------
  
      key: hashable
          Any variable that can be used as a key for a dictionary
  
      """
      figure_registry = _context["figure_registry"]
      if key not in figure_registry:
          return
      if _context["figure"] == figure_registry[key]:
          figure()
      fig = figure_registry[key]
      if hasattr(fig, "pyplot"):
          fig.pyplot.close()
          fig.pyplot_vbox.close()
      fig.close()
      del figure_registry[key]
      del _context["scale_registry"][key]
  
imports: import sys
  from collections import OrderedDict
  from IPython.display import display
  from ipywidgets import Image
  from numpy import arange, issubdtype, array, column_stack, shape
  from .figure import Figure
  from bqscales import Scale, LinearScale, Mercator
  from .axes import Axis
  from .marks import Lines, Scatter, Hist, Bars, OHLC, Pie, Map, Image, Label, HeatMap, GridHeatMap, topo_load, Boxplot, Bins
  from .interacts import BrushIntervalSelector, FastIntervalSelector, BrushSelector, IndexSelector, MultiSelector, LassoSelector
  from traitlets.utils.sentinel import Sentinel
  import functools
label_desc: Use image node_id 4 for calling a global function with example usage: close(key) without return types