Python 2.7: Requirements for older python and patches for imports

openapi_core/__init__.py

@@ -1,5 +1,8 @@
 # -*- coding: utf-8 -*-
 
+"""Python 2.7 backward compatibility"""
+import openapi_core._python27_patch
+
 """OpenAPI core module"""
 from openapi_core.shortcuts import (
     create_spec, validate_parameters, validate_body, validate_data,

openapi_core/_python27_patch.py

@@ -0,0 +1,14 @@
+import functools
+try:
+    from functools import lru_cache
+
+except ImportError:
+    from backports.functools_lru_cache import lru_cache
+    functools.lru_cache = lru_cache
+
+try:
+    from functools import partialmethod
+
+except ImportError:
+    from backports.functools_partialmethod import partialmethod
+    functools.partialmethod = partialmethod

requirements_2.7.txt

@@ -0,0 +1,5 @@
+openapi-spec-validator
+six
+backports.functools-lru-cache
+backports.functools-partialmethod
+enum34

setup.py

@@ -53,6 +53,8 @@ init_path = os.path.join('openapi_core', '__init__.py')
 init_py = read_file(init_path)
 metadata = get_metadata(init_py)
 
+py27 = '_2.7' if sys.version_info < (3,) else ''
+
 
 setup(
     name='openapi-core',
@@ -69,11 +71,12 @@ setup(
         "Topic :: Software Development :: Libraries :: Python Modules",
         "Operating System :: OS Independent",
         'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Topic :: Software Development :: Libraries',
     ],
-    install_requires=read_requirements('requirements.txt'),
+    install_requires=read_requirements('requirements{}.txt'.format(py27)),
     tests_require=read_requirements('requirements_dev.txt'),
     extras_require={
         'flask':  ["werkzeug"],