remove useage of the deprecated pkg_resources (#4701)

setup.py: make clear that Python 3.7 is no longer supported

Co-authored-by: Lon Blauvelt <[email protected]>

setup.py

@@ -98,7 +98,7 @@ def run_setup():
           'Topic :: System :: Distributed Computing',
           'Topic :: Utilities'],
         license="Apache License v2.0",
-        python_requires=">=3.7",
+        python_requires=">=3.8",
         install_requires=install_requires,
         extras_require=extras_require,
         package_dir={'': 'src'},

src/toil/cwl/__init__.py

@@ -14,7 +14,7 @@
 import sys
 from functools import lru_cache
 
-from pkg_resources import DistributionNotFound, get_distribution
+from importlib.metadata import version, PackageNotFoundError
 
 try:
     # Setuptools 66+ will raise this if any package on the system has a version that isn't PEP440.
@@ -39,19 +39,14 @@ def check_cwltool_version() -> None:
     warning will be printed.
     """
     try:
-        installed_version = get_distribution("cwltool").version
+        installed_version = version("cwltool")
 
         if installed_version != cwltool_version:
             sys.stderr.write(
                 f"WARNING: You are using cwltool version {installed_version}, which is "
                 f"not the version Toil is tested against. To install the correct cwltool "
                 f"for Toil, do:\n\n\tpip install cwltool=={cwltool_version}\n\n"
             )
-    except DistributionNotFound:
+    except PackageNotFoundError:
         # cwltool is not installed
         pass
-    except InvalidVersion as e:
-        sys.stderr.write(
-            f"WARNING: Could not determine the installed version of cwltool because a package "
-            f"with an unacceptable version is installed: {e}\n"
-        )

src/toil/utils/toilMain.py

@@ -5,7 +5,7 @@
 import types
 from typing import Any, Dict
 
-import pkg_resources
+from importlib.metadata import version as metadata_version
 
 from toil.version import version
 
@@ -78,6 +78,6 @@ def printHelp(modules: Dict[str, types.ModuleType]) -> None:
 
 def printVersion() -> None:
     try:
-        print(pkg_resources.get_distribution('toil').version)
+        print(metadata_version('toil'))
     except:
         print(f'Version gathered from toil.version: {version}')

version_template.py

@@ -64,10 +64,6 @@ def mainCacheTag():
 
 def distVersion():
     """The distribution version identifying a published release on PyPI."""
-    from pkg_resources import parse_version
-    if isinstance(parse_version(baseVersion), tuple):
-        raise RuntimeError("Setuptools version 8.0 or newer required. Update by running "
-                           "'pip install setuptools --upgrade'")
     return baseVersion