Dropped support for Python versions below 3.6.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

CONTRIBUTING.rst

@@ -120,7 +120,7 @@ Before you submit a pull request, check that it meets these guidelines:
 2. If the pull request adds functionality, the docs should be updated. Put
    your new functionality into a function with a docstring, and add the
    feature to the list in README.rst.
-3. The pull request should work for Python 2.6, 2.7, 3.3, 3.4 and 3.5, and for PyPy. Check
+3. The pull request should work for Python 3.6+, and for PyPy. Check
    https://travis-ci.org/danschef/arosics/pull_requests
    and make sure that the tests pass for all supported Python versions.
 

arosics/CoReg_local.py

@@ -24,7 +24,6 @@
 import warnings
 import os
 from copy import copy
-from six import PY2
 from typing import TYPE_CHECKING
 
 # custom
@@ -176,9 +175,6 @@ class COREG_LOCAL(object):
             warnings.warn("'-out_gsd' is ignored because '-match_gsd' is set.\n")
         if out_gsd:
             assert isinstance(out_gsd, list) and len(out_gsd) == 2, 'out_gsd must be a list with two values.'
-        if PY2 and (CPUs is None or (isinstance(CPUs, int) and CPUs > 1)):
-            CPUs = 1
-            warnings.warn('Multiprocessing is currently not supported for Python 2. Using singleprocessing.')
 
         self.params = dict([x for x in locals().items() if x[0] != "self" and not x[0].startswith('__')])
 

docs/installation.rst

@@ -59,8 +59,8 @@ you through the process.
 
 .. note::
 
-    AROSICS has been tested with Python 3.4+ and Python 2.7. It should be fully compatible to all Python versions
-    from 2.7 onwards. However, we will continously drop the support for Python 2.7 in future.
+    AROSICS has been tested with Python 3.6+. It should be fully compatible to all Python versions
+    from 3.6 onwards. Python 2.7 support was dropped in AROSICS 1.3 due to its end of life status.
 
 
 .. _pip: https://pip.pypa.io

requirements.txt

@@ -15,4 +15,3 @@ pyproj>2.2.0
 py_tools_ds>=0.15.10
 scikit-image>=0.16.0
 shapely
-six

requirements_pip.txt

 folium>=0.6.0,!=0.12.0
 geojson
 plotly
-six

setup.py

@@ -55,7 +55,6 @@ req = [
     'py_tools_ds>=0.15.10',
     'scikit-image>=0.16.0',
     'shapely',
-    'six',
 ]
 
 req_setup = [
@@ -83,8 +82,6 @@ setup(
         'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
         'Natural Language :: English',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

tests/CI_docker/context/environment_arosics.yml

@@ -27,7 +27,6 @@ dependencies:
     - folium>=0.6.0,!=0.12.0
     - geojson
     - plotly
-    - six
 
     # doc requirements
     - coverage

tox.ini

 [tox]
-envlist = py26, py27, py33, py34, py35, flake8
+envlist = py36, py37, py38, py39, flake8
 
 [travis]
 python =
-    3.5: py35
-    3.4: py34
-    3.3: py33
-    2.7: py27
-    2.6: py26
+    3.9: py39
+    3.8: py38
+    3.7: py37
+    3.6: py36
 
 [testenv:flake8]
 basepython=python