Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/flatbuffers/compat.py: 58%

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. Also includes 

16 compatibility helpers for numpy. """ 

17 

18import sys 

19 

20PY2 = sys.version_info[0] == 2 

21PY26 = sys.version_info[0:2] == (2, 6) 

22PY27 = sys.version_info[0:2] == (2, 7) 

23PY275 = sys.version_info[0:3] >= (2, 7, 5) 

24PY3 = sys.version_info[0] == 3 

25PY34 = sys.version_info[0:2] >= (3, 4) 

26 

27if PY3: 

28 import importlib.machinery 

29 string_types = (str,) 

30 binary_types = (bytes,bytearray) 

31 range_func = range 

32 memoryview_type = memoryview 

33 struct_bool_decl = "?" 

34else: 

35 import imp 

36 string_types = (unicode,) 

37 if PY26 or PY27: 

38 binary_types = (str,bytearray) 

39 else: 

40 binary_types = (str,) 

41 range_func = xrange 

42 if PY26 or (PY27 and not PY275): 

43 memoryview_type = buffer 

44 struct_bool_decl = "<b" 

45 else: 

46 memoryview_type = memoryview 

47 struct_bool_decl = "?" 

48 

49# Helper functions to facilitate making numpy optional instead of required 

50 

51def import_numpy(): 

52 """ 

53 Returns the numpy module if it exists on the system, 

54 otherwise returns None. 

55 """ 

56 if PY3: 

57 numpy_exists = ( 

58 importlib.machinery.PathFinder.find_spec('numpy') is not None) 

59 else: 

60 try: 

61 imp.find_module('numpy') 

62 numpy_exists = True 

63 except ImportError: 

64 numpy_exists = False 

65 

66 if numpy_exists: 

67 # We do this outside of try/except block in case numpy exists 

68 # but is not installed correctly. We do not want to catch an 

69 # incorrect installation which would manifest as an 

70 # ImportError. 

71 import numpy as np 

72 else: 

73 np = None 

74 

75 return np 

76 

77 

78class NumpyRequiredForThisFeature(RuntimeError): 

79 """ 

80 Error raised when user tries to use a feature that 

81 requires numpy without having numpy installed. 

82 """ 

83 pass 

84 

85 

86# NOTE: Future Jython support may require code here (look at `six`).