text: # _common.py
  
  from __future__ import unicode_literals
  
  import sys
  import codecs
  import locale
  
  PY2 = sys.version_info.major == 2
  
  ENCODING = 'utf-8'
  
  DIALECT = 'excel'
  
  ROWTYPE = 'list'
  
  EIGHT_BIT_CLEAN = {
      'ascii',
      'cp437', 'cp720', 'cp737', 'cp775',
      'cp850', 'cp852', 'cp855', 'cp856', 'cp857', 'cp858',
      'cp860', 'cp861', 'cp862', 'cp863', 'cp864', 'cp865', 'cp866', 'cp869',
      'cp1006', 'cp1125',
      'cp1250', 'cp1251', 'cp1252', 'cp1253', 'cp1254', 'cp1255', 'cp1256', 'cp1257', 'cp1258',
      'cp65001',
      'iso8859-1', 'iso8859-2', 'iso8859-3', 'iso8859-4', 'iso8859-5', 'iso8859-6',
      'iso8859-7', 'iso8859-8', 'iso8859-9', 'iso8859-10', 'iso8859-11', 'iso8859-13',
      'iso8859-14', 'iso8859-15', 'iso8859-16',
      'mac-cyrillic', 'mac-greek', 'mac-iceland', 'mac-latin2', 'mac-roman', 'mac-turkish',
      'utf-8',
  }
  
  PY2_BYTEARGS = {'delimiter', 'lineterminator', 'quotechar', 'escapechar'}
  
  
  def none_encoding():
      return locale.getpreferredencoding()
  
  
  def is_8bit_clean(encoding):
      return codecs.lookup(encoding).name in EIGHT_BIT_CLEAN
  
  
  if PY2:
      def csv_args(kwargs, _bytekeys=PY2_BYTEARGS):
          """Cast csv.reader/writer kwargs values from unicode to str."""
          for k in (kwargs.viewkeys() & _bytekeys):
              v = kwargs[k]
              if isinstance(v, unicode):
                  kwargs[k] = str(v)
          return kwargs
  
  else:
      def csv_args(kwargs):
          raise NotImplementedError
  
  
  class lazyproperty(object):
      """Non-data descriptor caching the computed result as instance attribute.
  
      >>> import itertools
      >>> class Spam(object):
      ...     @lazyproperty
      ...     def eggs(self, _ints=itertools.count()):
      ...         return next(_ints)
  
      >>> spam = Spam(); (spam.eggs, spam.eggs)
      (0, 0)
      >>> spam.eggs = 'eggs'; str(spam.eggs)
      'eggs'
      >>> del spam.eggs; (spam.eggs, spam.eggs)
      (1, 1)
      >>> Spam().eggs
      2
      >>> Spam.eggs  # doctest: +ELLIPSIS
      <...lazyproperty object at 0x...>
      """
  
      def __init__(self, fget):
          self.fget = fget
          for attr in ('__module__', '__name__', '__doc__'):
              setattr(self, attr, getattr(fget, attr))
  
      def __get__(self, instance, owner):
          if instance is None:
              return self
          result = instance.__dict__[self.__name__] = self.fget(instance)
          return result
  