build(python): drop support for Python 3.6 and 3.7 (#453)

BREAKING CHANGE: drop support for Python 3.6 and 3.7

Closes reanahub/reana#784

.github/workflows/ci.yml

@@ -55,7 +55,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: "3.8"
 
       - name: Check Python code formatting
         run: |
@@ -71,7 +71,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: "3.8"
 
       - name: Check compliance with pep8, pyflakes and circular complexity
         run: |
@@ -87,7 +87,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: "3.8"
 
       - name: Check compliance with Python docstring conventions
         run: |
@@ -103,7 +103,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: "3.8"
 
       - name: Check Python manifest completeness
         run: |
@@ -119,7 +119,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: "3.8"
 
       - name: Install system dependencies
         run: |
@@ -143,7 +143,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - name: Checkout

setup.py

@@ -36,19 +36,12 @@
     "yadage": ["adage~=0.10.1", "yadage~=0.20.1", "yadage-schemas~=0.10.6"],
     "cwl": ["cwltool==3.1.20210628163208"],
     "snakemake": [
-        "snakemake==6.15.5 ; python_version<'3.7'",  # Snakemake v7 requires Python 3.7+
-        "snakemake==7.32.4 ; python_version>='3.7'",
-        "tabulate<0.9",
+        "snakemake==7.32.4",
         "pulp>=2.7.0,<2.8.0",
-        "smart-open<7 ; python_version<'3.7'",  # see https://github.com/piskvorky/smart_open/issues/806
     ],
     "snakemake-reports": [
-        "snakemake[reports]==6.15.5 ; python_version<'3.7'",
-        "snakemake[reports]==7.32.4 ; python_version>='3.7'",
-        "pygraphviz<1.8",
-        "tabulate<0.9",  # tabulate 0.9 crashes snakemake, more info: https://github.com/snakemake/snakemake/issues/1899
+        "snakemake[reports]==7.32.4",
         "pulp>=2.7.0,<2.8.0",
-        "smart-open<7 ; python_version<'3.7'",  # see https://github.com/piskvorky/smart_open/issues/806
     ],
 }
 
@@ -104,7 +97,7 @@
     ],
     zip_safe=False,
     include_package_data=True,
-    python_requires=">=3.6",
+    python_requires=">=3.8",
     install_requires=install_requires,
     extras_require=extras_require,
     setup_requires=setup_requires,
@@ -116,8 +109,6 @@
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",

tests/test_workspace.py

@@ -1,13 +1,13 @@
 # -*- coding: utf-8 -*-
 #
 # This file is part of REANA.
-# Copyright (C) 2022 CERN.
+# Copyright (C) 2022, 2024 CERN.
 #
 # REANA is free software; you can redistribute it and/or modify it
 # under the terms of the MIT License; see LICENSE file for more details.
 """Workspace utilities tests"""
 
-import contextlib
+from contextlib import nullcontext as does_not_raise
 import os
 from pathlib import Path
 
@@ -16,13 +16,6 @@
 from reana_commons import workspace
 
 
-# FIXME: use `contextlib.nullcontext` when moving to Python 3.7
-@contextlib.contextmanager
-def does_not_raise():
-    """Context manager that does nothing."""
-    yield None
-
-
 @pytest.fixture()
 def test_workspace(tmp_path: Path):
     """Workspace containing test files."""