add tests and compatibility statement for python 3.6 (#286)

* add python 3.6 env file

* add python 3.6 to travis config

* add 3.6 to readme

* add classifier

* remove unavailable and optional dependencies from 3.6 tests

* replace manual version string checking with pkg_resources. pandas 0.19.2 was distributed with a dirtry version string

Author: wholmgren

.travis.yml

@@ -16,6 +16,8 @@ matrix:
       env: CONDA_ENV=py34
     - python: 3.5
       env: CONDA_ENV=py35
+    - python: 3.6
+      env: CONDA_ENV=py36
 
 addons:
     apt:

README.md

@@ -31,7 +31,7 @@ Installation
 pvlib-python releases may be installed using the ``pip`` and ``conda`` tools.
 Please see the [Installation page](http://pvlib-python.readthedocs.io/en/latest/installation.html) of the documentation for complete instructions.
 
-pvlib-python is compatible with Python versions 2.7, 3.4, 3.5
+pvlib-python is compatible with Python versions 2.7, 3.4, 3.5, 3.6
 
 
 Contributing

ci/requirements-py36.yml

@@ -0,0 +1,18 @@
+name: test_env
+channels:
+    - defaults
+    - conda-forge
+dependencies:
+    - python=3.6
+    - numpy
+    - scipy
+    - pandas
+    - pytz
+    #- ephem
+    #- numba
+    #- siphon
+    - pytest
+    - pytest-cov
+    - nose
+    - pip:
+        - coveralls

pvlib/test/conftest.py

@@ -1,6 +1,7 @@
 import sys
 import platform
 
+from pkg_resources import parse_version
 import pandas as pd
 import numpy as np
 import pytest
@@ -25,22 +26,14 @@
 
 
 def pandas_0_17():
-    version = tuple(map(int, pd.__version__.split('.')))
-    if version[0] <= 0 and version[1] < 17:
-        return False
-    else:
-        return True
+    return parse_version(pd.__version__) >= parse_version('0.17.0')
 
 needs_pandas_0_17 = pytest.mark.skipif(
     not pandas_0_17(), reason='requires pandas 0.17 or greater')
 
 
 def numpy_1_10():
-    version = tuple(map(int, np.__version__.split('.')))
-    if version[0] <= 1 and version[1] < 10:
-        return False
-    else:
-        return True
+    return parse_version(np.__version__) >= parse_version('1.10.0')
 
 needs_numpy_1_10 = pytest.mark.skipif(
     not numpy_1_10(), reason='requires numpy 1.10 or greater')

setup.py

@@ -59,6 +59,7 @@
     'Programming Language :: Python :: 3.3',
     'Programming Language :: Python :: 3.4',
     'Programming Language :: Python :: 3.5',
+    'Programming Language :: Python :: 3.6',
     'Topic :: Scientific/Engineering',
 ]