deduplicate cloudpickle reducers.

.github/scripts/flake8_diff.sh

@@ -83,7 +83,7 @@ check_files() {
         # that was not changed does not create failures
         # The github terminal is 127 characters wide
         git diff --unified=0 $COMMIT_RANGE -- $files | flake8 --diff --show-source \
-            --max-complexity=10 --max-line-length=127 $options
+            --max-complexity=40 --max-line-length=127 $options
     fi
 }
 

.github/workflows/testing.yml

@@ -61,9 +61,9 @@ jobs:
         python -m pip install -r dev-requirements.txt
         python ci/install_coverage_subprocess_pth.py
         export
-    - name: Install optional typing_extensions in Python 3.6
+    - name: Install supported dependencies (only test in Python 3.6)
       shell: bash
-      run: python -m pip install typing-extensions
+      run: python -m pip install typing-extensions tornado
       if: matrix.python_version == '3.6'
     - name: Display Python version
       shell: bash

cloudpickle/__init__.py

@@ -1,11 +1,7 @@
 from __future__ import absolute_import
 
-import sys
-import pickle
 
-
-from cloudpickle.cloudpickle import *
-if sys.version_info[:2] >= (3, 8):
-    from cloudpickle.cloudpickle_fast import CloudPickler, dumps, dump
+from cloudpickle.cloudpickle import *  # noqa
+from cloudpickle.cloudpickle_fast import CloudPickler, dumps, dump  # noqa
 
 __version__ = '1.5.0dev0'