Drop Python 2.7 (dask#4919)

jcrist · web-flow · commit 6e8c1b76feb1 · 2019-06-12T15:55:11.000-05:00
* Drop Python 2.7

Drops Python 2.7 from our `setup.py`, and from our test matrix. We don't
drop any of the compatability fixes (yet), but won't be adding new ones.

* fixup
diff --git a/.travis.yml b/.travis.yml
@@ -17,20 +17,11 @@ jobs:
   fast_finish: true
   include:
     - env:
-      - PYTHON=2.7
+      - PYTHON=3.5
       - NUMPY=1.13.0
       - PANDAS=0.21.1
       - *test_and_lint
       - *no_coverage
-      - *optimize
-      - *no_imports
-
-    - env:
-      - PYTHON=3.5
-      - NUMPY=1.14.1
-      - PANDAS=0.22.0
-      - *test_and_lint
-      - *no_coverage
       - *no_optimize
       - *no_imports
 
diff --git a/continuous_integration/travis/install.sh b/continuous_integration/travis/install.sh
@@ -87,10 +87,6 @@ if [[ $NUMPY > '1.13.0' ]]; then
     fi
 fi
 
-if [[ $PYTHON == '2.7' ]]; then
-    pip install --no-deps backports.lzma mock
-fi
-
 pip install --upgrade --no-deps \
     cachey \
     graphviz \
diff --git a/dask/dataframe/io/tests/test_parquet.py b/dask/dataframe/io/tests/test_parquet.py
@@ -12,7 +12,7 @@
 import dask
 import dask.multiprocessing
 import dask.dataframe as dd
-from dask.dataframe.utils import assert_eq
+from dask.dataframe.utils import assert_eq, PANDAS_VERSION
 from dask.dataframe.io.parquet import _parse_pandas_metadata
 from dask.utils import natural_sort_key
 
@@ -476,8 +476,8 @@ def test_optimize(tmpdir, c):
     assert all(v[4] == c for v in dsk.values())
 
 
-@pytest.mark.skipif(not hasattr(pd.DataFrame, 'to_parquet'),
-                    reason="no to_parquet method")
+@pytest.mark.skipif(PANDAS_VERSION < '0.22.0',
+                    reason="new pyarrow assumes new-ish pandas versions")
 @write_read_engines()
 def test_roundtrip_from_pandas(tmpdir, write_engine, read_engine):
     fn = str(tmpdir.join('test.parquet'))
diff --git a/setup.py b/setup.py
@@ -39,16 +39,14 @@
       license='BSD',
       keywords='task-scheduling parallel numpy pandas pydata',
       classifiers=[
-          "Programming Language :: Python :: 2",
-          "Programming Language :: Python :: 2.7",
           "Programming Language :: Python :: 3",
           "Programming Language :: Python :: 3.5",
           "Programming Language :: Python :: 3.6",
           "Programming Language :: Python :: 3.7",
       ],
       packages=packages + tests,
       long_description=open('README.rst').read() if exists('README.rst') else '',
-      python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*",
+      python_requires=">=3.5",
       setup_requires=setup_requires,
       tests_require=['pytest'],
       extras_require=extras_require,
