text: ###
  # Copyright (c) 2004-2005, Jeremiah Fincher
  # Copyright (c) 2010-2021, Valentin Lorentz
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #
  #   * Redistributions of source code must retain the above copyright notice,
  #     this list of conditions, and the following disclaimer.
  #   * Redistributions in binary form must reproduce the above copyright notice,
  #     this list of conditions, and the following disclaimer in the
  #     documentation and/or other materials provided with the distribution.
  #   * Neither the name of the author of this software nor the name of
  #     contributors to this software may be used to endorse or promote products
  #     derived from this software without specific prior written consent.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  # ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  ###
  
  import sys
  
  class DynamicScope(object):
      def _getLocals(self, name):
          f = sys._getframe().f_back.f_back # _getLocals <- __[gs]etattr__ <- ...
          while f:
              if name in f.f_locals:
                  return f.f_locals
              f = f.f_back
          raise NameError(name)
      
      def __getattr__(self, name):
          try:
              return self._getLocals(name)[name]
          except (NameError, KeyError):
              return None
              
      def __setattr__(self, name, value):
          self._getLocals(name)[name] = value
  
  (__builtins__ if isinstance(__builtins__, dict) else __builtins__.__dict__)['dynamic'] = DynamicScope()
  
  # vim:set shiftwidth=4 softtabstop=4 expandtab textwidth=79:
  