code: def main(args=None):
      """Add `avar` table from designspace file to variable font."""
  
      if args is None:
          import sys
  
          args = sys.argv[1:]
  
      from fontTools import configLogger
      from fontTools.ttLib import TTFont
      from fontTools.designspaceLib import DesignSpaceDocument
      import argparse
  
      parser = argparse.ArgumentParser(
          "fonttools varLib.avar",
          description="Add `avar` table from designspace file to variable font.",
      )
      parser.add_argument(
          "font", metavar="varfont.ttf", help="Variable-font file."
      )
      parser.add_argument(
          "designspace",
          metavar="family.designspace",
          help="Designspace file.",
      )
      parser.add_argument(
          "-o",
          "--output-file",
          type=str,
          help="Output font file name.",
      )
      parser.add_argument(
          "-v",
          "--verbose",
          action="store_true",
          help="Run more verbosely.",
      )
  
      options = parser.parse_args(args)
  
      configLogger(level=("INFO" if options.verbose else "WARNING"))
  
      font = TTFont(options.font)
      if not "fvar" in font:
          log.error("Not a variable font.")
          return 1
  
      axisTags = [a.axisTag for a in font["fvar"].axes]
  
      ds = load_designspace(options.designspace)
  
      if "avar" in font:
          log.warning("avar table already present, overwriting.")
          del font["avar"]
  
      _add_avar(font, ds.axes, ds.axisMappings, axisTags)
  
      if options.output_file is None:
          outfile = makeOutputFileName(
              options.font, overWrite=True, suffix=".avar"
          )
      else:
          outfile = options.output_file
      if outfile:
          log.info("Saving %s", outfile)
          font.save(outfile)
  
imports: from fontTools.varLib import _add_avar, load_designspace
  from fontTools.misc.cliTools import makeOutputFileName
  import logging
label_desc: Use image node_id 1 for calling a global function with example usage: main(args) and returns: int