Drop Python 2 support (#1018)

Author: pierreglaser

CHANGES.rst

@@ -4,6 +4,12 @@ Latest changes
 Release 0.14.2
 --------------
 
+- Drop support for Python 2 and Python 3.5. All objects in
+  ``joblib.my_exceptions`` and ``joblib.format_stack`` are now deprecated and
+  will be removed in joblib 0.16. Note that no deprecation warning will be
+  raised for these objects Python < 3.7.
+  https://github.com/joblib/joblib/pull/1018
+
 - Fix the number of jobs reported by ``effective_n_jobs`` when ``n_jobs=None``
   called in a parallel backend context.
   https://github.com/joblib/joblib/pull/985

azure-pipelines.yml

@@ -62,39 +62,25 @@ jobs:
         PYTHON_VERSION: "3.6"
         EXTRA_CONDA_PACKAGES: "numpy=1.14"
         JOBLIB_MULTIPROCESSING: "0"
-      linux_py35_no_numpy:
+      linux_py36_no_numpy:
         imageName: 'ubuntu-latest'
-        PYTHON_VERSION: "3.5"
-      linux_py27_no_lza:
-        imageName: 'ubuntu-latest'
-        NO_LZ4: "true"
-        PYTHON_VERSION: "2.7"
-        EXTRA_CONDA_PACKAGES: "numpy=1.16"
+        PYTHON_VERSION: "3.6"
 
       windows_py38:
         imageName: "vs2017-win2016"
         PYTHON_VERSION: "3.8"
         EXTRA_CONDA_PACKAGES: "numpy=1.18"
-      windows_py35_no_numpy:
+      windows_py36_no_numpy:
         imageName: "vs2017-win2016"
-        PYTHON_VERSION: "3.5"
-      windows-py27:
-        imageName: "vs2017-win2016"
-        PYTHON_VERSION: "2.7"
-        EXTRA_CONDA_PACKAGES: "numpy=1.16"
+        PYTHON_VERSION: "3.6"
 
       macos_py38:
         imageName: "macos-10.14"
         PYTHON_VERSION: "3.8"
         EXTRA_CONDA_PACKAGES: "numpy=1.18"
-      macos_py35_no_numpy:
-        imageName: "macos-10.14"
-        PYTHON_VERSION: "3.5"
-      macos_py27:
+      macos_py36_no_numpy:
         imageName: "macos-10.14"
-        PYTHON_VERSION: "2.7"
-        EXTRA_CONDA_PACKAGES: "numpy=1.16"
-
+        PYTHON_VERSION: "3.6"
 
   variables:
     JUNITXML: 'test-data.xml'

conftest.py

@@ -53,16 +53,12 @@ def pytest_configure(config):
 
 
 def pytest_unconfigure(config):
-    try:
-        # Setup a global traceback printer callback to debug deadlocks that
-        # would happen once pytest has completed: for instance in atexit
-        # finalizers. At this point the stdout/stderr capture of pytest
-        # should be disabled.
+    # Setup a global traceback printer callback to debug deadlocks that
+    # would happen once pytest has completed: for instance in atexit
+    # finalizers. At this point the stdout/stderr capture of pytest
+    # should be disabled.
 
-        # Note that we also use a shorter timeout for the per-test callback
-        # configured via the pytest-timeout extension.
-        import faulthandler
-        faulthandler.dump_traceback_later(60, exit=True)
-    except ImportError:
-        # Python 2 backward compat.
-        pass
+    # Note that we also use a shorter timeout for the per-test callback
+    # configured via the pytest-timeout extension.
+    import faulthandler
+    faulthandler.dump_traceback_later(60, exit=True)

continuous_integration/install.sh

@@ -18,7 +18,7 @@ create_new_conda_env() {
 }
 
 create_new_pypy3_env() {
-    PYPY_FOLDER="pypy3-v6.0.0-linux64"
+    PYPY_FOLDER="pypy3.6-v7.3.1-linux64"
     wget https://bitbucket.org/pypy/pypy/downloads/$PYPY_FOLDER.tar.bz2
     tar xvf $PYPY_FOLDER.tar.bz2
     $PYPY_FOLDER/bin/pypy3 -m venv pypy3
@@ -53,7 +53,7 @@ if [[ "$COVERAGE" == "true" ]]; then
     PIP_INSTALL_PACKAGES="$PIP_INSTALL_PACKAGES coverage==4.5.4 pytest-cov codecov"
 fi
 
-if [[ "2.7 3.4 pypy3" != *"$PYTHON_VERSION"* ]]; then
+if [[ "pypy3" != *"$PYTHON_VERSION"* ]]; then
     # threadpoolctl is only available for python 3.5+.
     PIP_INSTALL_PACKAGES="$PIP_INSTALL_PACKAGES threadpoolctl"
 fi

continuous_integration/run_tests.sh

@@ -21,9 +21,7 @@ if [[ "$SKIP_TESTS" != "true" ]]; then
     fi
 
     pytest joblib -vl --timeout=60 --junitxml="${JUNITXML}"
-    if [[ "$PYTHON_VERSION" != "2.7" ]]; then
-        make test-doc
-    fi
+    make test-doc
 fi
 
 if [[ "$SKLEARN_TESTS" == "true" ]]; then

joblib/_compat.py

@@ -35,14 +35,6 @@ def is_weakrefable(obj):
         return False
 
 
-try:
-    TimeoutError = TimeoutError
-except NameError:
-    # Python 2 backward compat
-    class TimeoutError(OSError):
-        pass
-
-
 class _WeakKeyDictionary:
     """A variant of weakref.WeakKeyDictionary for unhashable objects.