1import sys 2 3__all__ = ( 4 'text_type', 'string_types', 'izip', 'iteritems', 'itervalues', 5 'with_metaclass', 6) 7 8if sys.version_info[0] >= 3: 9 text_type = str 10 string_types = (str, ) 11 izip = zip 12 13 def iteritems(o): 14 return o.items() 15 16 def itervalues(o): 17 return o.values() 18 19else: 20 text_type = unicode 21 string_types = (basestring, ) 22 from itertools import izip 23 24 def iteritems(o): 25 return o.iteritems() 26 27 def itervalues(o): 28 return o.itervalues() 29 30 31def with_metaclass(meta, base=object): 32 return meta("NewBase", (base,), {}) 33