1import sys 2 3PY3 = sys.version_info[0] >= 3 4 5if PY3: 6 unicode = str 7 basestring = str 8 xrange = range 9 from io import StringIO 10 from io import BytesIO 11else: 12 unicode = unicode 13 basestring = basestring 14 xrange = xrange 15 from StringIO import StringIO 16 from StringIO import StringIO as BytesIO 17