text: # Copyright (c) 2015-2020 Vector 35 Inc
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to
  # deal in the Software without restriction, including without limitation the
  # rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  # sell copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  # IN THE SOFTWARE.
  
  # 2-3 compatibility
  import sys
  
  PY2 = sys.version_info[0] == 2
  PY3 = sys.version_info[0] == 3
  PY34 = sys.version_info[0:2] >= (3, 4)
  
  
  if PY2:
    def range(*args):
      return xrange(*args)
  
    def valid_import(mod_name):
      import imp
      try:
        imp.find_module(mod_name)
        found = True
      except ImportError:
        found = False
      return found
  
    def pyNativeStr(arg):
      return arg
  
  
  if PY3:
    range = range  # Range needs to explicitly be defined or it's an error
  
    def valid_import(mod_name):
      import importlib
      mod_loader = importlib.find_loader(mod_name)
      found = mod_loader is not None
      return found
  
    def pyNativeStr(arg):
      if isinstance(arg, str):
        return arg
      else:
        try:
          return arg.decode('utf8')
        except UnicodeDecodeError:
          return arg.decode('charmap')
  
  
  if PY34:
    def valid_import(mod_name):
      import importlib.util
      return importlib.util.find_spec(mod_name) is not None
  
  
  def with_metaclass(meta, *bases):
    """Create a base class with a metaclass."""
    class metaclass(type):
      def __new__(cls, name, this_bases, d):
        return meta(name, bases, d)
  
      @classmethod
      def __prepare__(cls, name, this_bases):
        return meta.__prepare__(name, bases)
    return type.__new__(metaclass, 'temporary_class', (), {})
  
  
  def cstr(arg):
    if isinstance(arg, bytes) or arg is None:
      return arg
    else:
      try:
        return arg.encode('charmap')
      except UnicodeEncodeError:
        return arg.encode('utf8')
  