Drop support for Python 2.7 (#280)

.travis.yml

@@ -6,10 +6,6 @@ notifications:
 matrix:
   fast_finish: true
   include:
-  - python: 2.7
-    env: CONDA_ENV=py27
-  - python: 2.7
-    env: CONDA_ENV=py27-min
   - python: 3.5
     env: CONDA_ENV=py35
   - python: 3.6
@@ -21,11 +17,7 @@ matrix:
     env: CONDA_ENV=py36-xarray-dev
 
 before_install:
-  - if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then
-      wget https://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh -O miniconda.sh;
-    else
-      wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh;
-    fi
+  - wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh;
   - bash miniconda.sh -b -p $HOME/miniconda
   - export PATH="$HOME/miniconda/bin:$PATH"
   - hash -r

appveyor.yml

@@ -5,11 +5,6 @@
 environment:
 
   matrix:
-    - PYTHON: "C:\\Python27-conda64"
-      PYTHON_VERSION: "2.7"
-      PYTHON_ARCH: "64"
-      CONDA_ENV: "py27"
-
     - PYTHON: "C:\\Python35-conda64"
       PYTHON_VERSION: "3.5"
       PYTHON_ARCH: "64"

ci/environment-py27-min.yml → ci/environment-py36-min.yml

@@ -2,7 +2,7 @@ name: test_env
 channels:
   - conda-forge
 dependencies:
-  - python=2.7
+  - python=3.6
   - scipy
   - netCDF4
   - xarray

docs/install.rst

@@ -7,7 +7,7 @@ Supported platforms
 -------------------
 
 - Operating system: Windows, MacOS/Mac OS X, and Linux
-- Python: 2.7, 3.5, and 3.6
+- Python: 3.5 and 3.6
 
 .. note::
 

docs/whats-new.rst

@@ -16,8 +16,8 @@ Breaking Changes
   explicit ``east_bound``, ``west_bound``, ``south_bound``, and
   ``north_bound`` (:pull:`266`).  By `Spencer Hill
   <https://github.com/spencerahill>`_.
-- Drop support for Python 3.4, since our core upstream dependency
-  xarray is also dropping it as of their 0.11 release (:pull:`255`).
+- Drop support for Python 2.7 and 3.4, since our core upstream dependency
+  xarray is also dropping these soon (:pull:`255`, :pull:`280`).
   By `Spencer Hill <https://github.com/spencerahill>`_.
 - Deprecate ``Constant`` class and ``constants.py`` module.
   Physical constants used internally by aospy are now stored

setup.py

@@ -49,7 +49,6 @@
         'License :: OSI Approved :: Apache Software License',
         'Natural Language :: English',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',