Add typing.

.github/workflows/pythonpackage.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, '3.10', pypy3]
+        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, '3.10', '3.11', pypy3]
         exclude: 
           - os: macos-latest
             python-version: pypy3
@@ -25,16 +25,15 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        python -m pip install --upgrade pip
+        python -m pip install --upgrade pip mypy
         pip install -U pip flake8 setuptools
     - name: Style checks
-      run: |
-        python -m flake8
+      run: python -m flake8
+    - name: Typing checks
+      run: python -m mypy patiencediff
     - name: Build
-      run: |
-        python setup.py build_ext -i
+      run: python setup.py build_ext -i
     - name: Test suite run
-      run: |
-        python -m unittest patiencediff.test_patiencediff
+      run: python -m unittest patiencediff.test_patiencediff
       env:
         PYTHONHASHSEED: random

patiencediff/__main__.py

@@ -14,8 +14,6 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
-from __future__ import absolute_import
-
 import sys
 import difflib