Set minimum python version to 3.7 (#253)

* Set minimum python version to 3.7

and maximum version to 3.9

* Update github actions

Co-authored-by: Andres Perez Hortal <16256571+aperezhortal@users.noreply.github.com>

Author: dnerini

.github/workflows/test_pysteps.yml

@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ "ubuntu-latest", "macos-latest", "windows-latest" ]
-        python-version: [ "3.6", "3.8" ]
+        python-version: [ "3.7", "3.9" ]
       max-parallel: 6
 
     defaults:

doc/source/user_guide/install_pysteps.rst

@@ -8,7 +8,7 @@ Dependencies
 
 The pysteps package needs the following dependencies
 
-* `python >=3.6 <http://www.python.org/>`_
+* `python >=3.7 <http://www.python.org/>`_ (lower versions may work but they are not officially supported).
 * `jsonschema <https://pypi.org/project/jsonschema/>`_
 * `matplotlib <http://matplotlib.org/>`_
 * `netCDF4 <https://pypi.org/project/netCDF4/>`_

environment.yml

@@ -3,7 +3,7 @@ channels:
 - conda-forge
 - defaults
 dependencies:
-  - python>=3.6
+  - python>=3.7
   - jsmin
   - jsonschema
   - matplotlib

environment_dev.yml

@@ -4,7 +4,7 @@ channels:
   - conda-forge
   - defaults
 dependencies:
-  - python>=3.6
+  - python>=3.7
   - pip
   - jsmin
   - jsonschema

requirements_dev.txt

@@ -1,5 +1,5 @@
 # Base dependencies
-python>=3.6
+python>=3.7
 numpy
 opencv-python
 pillow

setup.py

@@ -93,7 +93,10 @@
         "Topic :: Scientific/Engineering :: Atmospheric Science",
         "Topic :: Scientific/Engineering :: Hydrology",
         "License :: OSI Approved :: BSD License",
-        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3 :: Only",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Operating System :: OS Independent",
     ],
     ext_modules=external_modules,

tox.ini

@@ -14,7 +14,7 @@
 # > tox -e black    # Test for black formatting warnings
 
 [tox]
-envlist = py36, py37, py38, py39
+envlist = py37, py38, py39
 
 [testenv]
 description = Run the pysteps's test suite