1# Copyright 2016 Google Inc. All rights reserved. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15""" A tiny version of `six` to help with backwards compability. """ 16 17import sys 18 19PY2 = sys.version_info[0] == 2 20PY26 = sys.version_info[0:2] == (2, 6) 21PY27 = sys.version_info[0:2] == (2, 7) 22PY275 = sys.version_info[0:3] >= (2, 7, 5) 23PY3 = sys.version_info[0] == 3 24PY34 = sys.version_info[0:2] >= (3, 4) 25 26if PY3: 27 string_types = (str,) 28 binary_types = (bytes,bytearray) 29 range_func = range 30 memoryview_type = memoryview 31 struct_bool_decl = "?" 32else: 33 string_types = (unicode,) 34 if PY26 or PY27: 35 binary_types = (str,bytearray) 36 else: 37 binary_types = (str,) 38 range_func = xrange 39 if PY26 or (PY27 and not PY275): 40 memoryview_type = buffer 41 struct_bool_decl = "<b" 42 else: 43 memoryview_type = memoryview 44 struct_bool_decl = "?" 45 46# NOTE: Future Jython support may require code here (look at `six`). 47