drop support for python 3.6

azure-pipelines.yml

@@ -8,14 +8,12 @@ jobs:
 - job: Linux
   strategy:
     matrix:
-      py36-bare-minimum:
-        conda_env: py36-bare-minimum
-      py36-min-all-deps:
-        conda_env: py36-min-all-deps
-      py36-min-nep18:
-        conda_env: py36-min-nep18
-      py36:
-        conda_env: py36
+      py37-bare-minimum:
+        conda_env: py37-bare-minimum
+      py37-min-all-deps:
+        conda_env: py37-min-all-deps
+      py37-min-nep18:
+        conda_env: py37-min-nep18
       py37:
         conda_env: py37
       py38:
@@ -121,6 +119,6 @@ jobs:
   - template: ci/azure/add-conda-to-path.yml
   - bash: |
       conda install -y pyyaml
-      python ci/min_deps_check.py ci/requirements/py36-bare-minimum.yml
-      python ci/min_deps_check.py ci/requirements/py36-min-all-deps.yml
+      python ci/min_deps_check.py ci/requirements/py37-bare-minimum.yml
+      python ci/min_deps_check.py ci/requirements/py37-min-all-deps.yml
     displayName: minimum versions policy

ci/requirements/py36-bare-minimum.yml → ci/requirements/py37-bare-minimum.yml

@@ -3,7 +3,7 @@ channels:
   - conda-forge
   - nodefaults
 dependencies:
-  - python=3.6
+  - python=3.7
   - coveralls
   - pip
   - pytest
@@ -12,4 +12,4 @@ dependencies:
   - pytest-xdist
   - numpy=1.15
   - pandas=0.25
-  - setuptools=38.4
+  - setuptools=40.4

ci/requirements/py36-min-all-deps.yml → ci/requirements/py37-min-all-deps.yml

@@ -7,7 +7,7 @@ dependencies:
   # Run ci/min_deps_check.py to verify that this file respects the policy.
   # When upgrading python, numpy, or pandas, must also change
   # doc/installing.rst and setup.py.
-  - python=3.6
+  - python=3.7
   - black
   - boto3=1.9
   - bottleneck=1.2
@@ -33,7 +33,7 @@ dependencies:
   - numba=0.46
   - numpy=1.15
   - pandas=0.25
-  # - pint  # See py36-min-nep18.yml
+  # - pint  # See py37-min-nep18.yml
   - pip
   - pseudonetcdf=3.0
   - pydap=3.2
@@ -45,8 +45,8 @@ dependencies:
   - rasterio=1.0
   - scipy=1.3
   - seaborn=0.9
-  - setuptools=38.4
-  # - sparse  # See py36-min-nep18.yml
+  - setuptools=40.4
+  # - sparse  # See py37-min-nep18.yml
   - toolz=0.10
   - zarr=2.3
   - pip:

ci/requirements/py36-min-nep18.yml → ci/requirements/py37-min-nep18.yml

@@ -5,7 +5,7 @@ channels:
 dependencies:
   # Optional dependencies that require NEP18, such as sparse and pint,
   # require drastically newer packages than everything else
-  - python=3.6
+  - python=3.7
   - coveralls
   - dask=2.9
   - distributed=2.9
@@ -18,5 +18,5 @@ dependencies:
   - pytest-env
   - pytest-xdist
   - scipy=1.3
-  - setuptools=38.4
+  - setuptools=40.4
   - sparse=0.8

doc/installing.rst

@@ -6,7 +6,7 @@ Installation
 Required dependencies
 ---------------------
 
-- Python (3.6 or later)
+- Python (3.7 or later)
 - setuptools (38.4 or later)
 - `numpy <http://www.numpy.org/>`__ (1.15 or later)
 - `pandas <http://pandas.pydata.org/>`__ (0.25 or later)

doc/whats-new.rst

@@ -22,7 +22,8 @@ v0.16.3 (unreleased)
 
 Breaking changes
 ~~~~~~~~~~~~~~~~
-
+- xarray no longer supports python 3.6 (:issue:`4688`, :pull:`4720`)
+  By `Justus Magin <https://github.com/keewis>`_.
 
 New Features
 ~~~~~~~~~~~~

setup.cfg

@@ -64,15 +64,15 @@ classifiers =
     Intended Audience :: Science/Research
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
     Topic :: Scientific/Engineering
 
 [options]
 packages = find:
 zip_safe = False  # https://mypy.readthedocs.io/en/latest/installed_packages.html
 include_package_data = True
-python_requires = >=3.6
+python_requires = >=3.7
 install_requires =
     numpy >= 1.15
     pandas >= 0.25