Drop python 3.6 starts testing python 3.9 (#1157)

* Drop 3.6 in favor of 3.9

* Drop 3.6 in favor of 3.9

* Test old ubuntu

.github/workflows/pytest.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-18.04
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.7, 3.8, 3.9]
         use-conda: [true, false]
         use-dist: [false]
         include:

doc/installation.rst

@@ -12,7 +12,7 @@ System requirements
 auto-sklearn has the following system requirements:
 
 * Linux operating system (for example Ubuntu) (`get Linux here <https://www.wikihow.com/Install-Linux>`_)
-* Python (>=3.6) (`get Python here <https://www.python.org/downloads/>`_),
+* Python (>=3.7) (`get Python here <https://www.python.org/downloads/>`_),
 * C++ compiler (with C++11 supports) (`get GCC here <https://www.tutorialspoint.com/How-to-Install-Cplusplus-Compiler-on-Linux>`_).
 
 In case you try to install Auto-sklearn on a system where no wheel files for the pyrfr package

setup.py

@@ -13,10 +13,10 @@
         sys.platform
     )
 
-if sys.version_info < (3, 6):
+if sys.version_info < (3, 7):
     raise ValueError(
         'Unsupported Python version %d.%d.%d found. Auto-sklearn requires Python '
-        '3.6 or higher.' % (sys.version_info.major, sys.version_info.minor, sys.version_info.micro)
+        '3.7 or higher.' % (sys.version_info.major, sys.version_info.minor, sys.version_info.micro)
     )
 
 HERE = os.path.abspath(os.path.dirname(__file__))
@@ -77,10 +77,10 @@
         "Operating System :: OS Independent",
         "Topic :: Scientific/Engineering :: Artificial Intelligence",
         "Topic :: Scientific/Engineering :: Information Analysis",
-        'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
     ],
-    python_requires='>=3.6',
+    python_requires='>=3.7',
     url='https://automl.github.io/auto-sklearn',
 )

test/test_evaluation/test_evaluation.py

@@ -351,7 +351,6 @@ def test_exception_in_target_function(self, eval_holdout_mock):
         self.assertIn('traceback', info[1].additional_info)
         self.assertNotIn('exitcode', info[1].additional_info)
 
-    @unittest.skipIf(sys.version_info < (3, 7), reason="requires python3.7 or higher")
     def test_silent_exception_in_target_function(self):
         config = unittest.mock.Mock()
         config.config_id = 198

test/test_pipeline/components/feature_preprocessing/test_kernel_pca.py

@@ -1,4 +1,3 @@
-import sys
 import unittest
 
 import pytest
@@ -12,7 +11,6 @@
 
 
 class KernelPCAComponentTest(PreprocessingTestCase):
-    @unittest.skipIf(sys.version_info < (3, 7), 'Random failures for Python < 3.7')
     def test_default_configuration(self):
         transformation, original = _test_preprocessing(KernelPCA,
                                                        dataset='digits',

test/test_scripts/test_metadata_generation.py

@@ -4,7 +4,6 @@
 import shutil
 import socket
 import subprocess
-import sys
 import unittest
 
 import arff
@@ -24,7 +23,6 @@ def print_files(self):
         for dirpath, dirnames, filenames in os.walk(self.working_directory):
             print(dirpath, dirnames, filenames)
 
-    @unittest.skipIf(sys.version_info < (3, 7), reason="requires python3.7 or higher")
     def test_metadata_generation(self):
 
         regression_task_id = 360029