code: def _interpret_args(self, args):
      f, gradient = None, self.gradient
      atoms, lists = self._sort_args(args)
      s = self._pop_symbol_list(lists)
      s = self._fill_in_vars(s)
  
      # prepare the error message for lambdification failure
      f_str = ", ".join(str(fa) for fa in atoms)
      s_str = (str(sa) for sa in s)
      s_str = ", ".join(sa for sa in s_str if sa.find("unbound") < 0)
      f_error = ValueError(
          "Could not interpret arguments "
          "%s as functions of %s." % (f_str, s_str)
      )
  
      # try to lambdify args
      if len(atoms) == 1:
          fv = atoms[0]
          try:
              f = lambdify(s, [fv, fv, fv])
          except TypeError:
              raise f_error
  
      elif len(atoms) == 3:
          fr, fg, fb = atoms
          try:
              f = lambdify(s, [fr, fg, fb])
          except TypeError:
              raise f_error
  
      else:
          raise ValueError(
              "A ColorScheme must provide 1 or 3 "
              "functions in x, y, z, u, and/or v."
          )
  
      # try to intrepret any given color information
      if len(lists) == 0:
          gargs = []
  
      elif len(lists) == 1:
          gargs = lists[0]
  
      elif len(lists) == 2:
          try:
              (r1, g1, b1), (r2, g2, b2) = lists
          except TypeError:
              raise ValueError(
                  "If two color arguments are given, "
                  "they must be given in the format "
                  "(r1, g1, b1), (r2, g2, b2)."
              )
          gargs = lists
  
      elif len(lists) == 3:
          try:
              (r1, r2), (g1, g2), (b1, b2) = lists
          except Exception:
              raise ValueError(
                  "If three color arguments are given, "
                  "they must be given in the format "
                  "(r1, r2), (g1, g2), (b1, b2). To create "
                  "a multi-step gradient, use the syntax "
                  "[0, colorStart, step1, color1, ..., 1, "
                  "colorEnd]."
              )
          gargs = [[r1, g1, b1], [r2, g2, b2]]
  
      else:
          raise ValueError(
              "Don't know what to do with collection "
              "arguments %s." % (", ".join(str(l) for l in lists))
          )
  
      if gargs:
          try:
              gradient = ColorGradient(*gargs)
          except Exception as ex:
              raise ValueError(
                  (
                      "Could not initialize a gradient "
                      "with arguments %s. Inner "
                      "exception: %s"
                  )
                  % (gargs, str(ex))
              )
  
      return f, gradient
  
imports: from sympy.core.basic import Basic
  from sympy.core.symbol import Symbol, symbols
  from sympy.utilities.lambdify import lambdify
  from .util import interpolate, rinterpolate, create_bounds, update_bounds
  from sympy.utilities.iterables import sift
label_desc: Use image node_id 2 for calling the ColorScheme obj's underlying member method code with example usage: obj._interpret_args(args) and returns: f,  gradient