Merge pull request #144 from pllim/distutils-deprecation

MNT: Stop using deprecated distutils

.readthedocs.yml

@@ -10,8 +10,7 @@ sphinx:
   fail_on_warning: true
 
 python:
-  version: 3.7
-  system_packages: true
+  version: 3.8
   install:
     - method: pip
       path: .

lib/stsci/__init__.py

@@ -1,10 +0,0 @@
-try:
-    # As long as we're using setuptools/distribute, we need to do this the
-    # setuptools way or else pkg_resources will throw up unncessary and
-    # annoying warnings (even though the namespace mechanism will still
-    # otherwise work without it).
-    # Get rid of this as soon as setuptools/distribute is dead.
-    __import__('pkg_resources').declare_namespace(__name__)
-except ImportError:
-    pass
-__path__ = __import__('pkgutil').extend_path(__path__, __name__)

lib/stsci/tools/stpyfits.py

@@ -15,9 +15,9 @@
 # overridden, but with fits's new extension system it's not necessary
 from astropy.io.fits.util import _is_int
 from astropy.utils import lazyproperty
-from distutils.version import LooseVersion
+from packaging.version import Version
 
-ASTROPY_VER_GE32 = LooseVersion(astropy.__version__) >= LooseVersion('3.2')
+ASTROPY_VER_GE32 = Version(astropy.__version__) >= Version('3.2')
 
 STPYFITS_ENABLED = False  # Not threadsafe TODO: (should it be?)
 

setup.cfg

@@ -26,6 +26,7 @@ zip_safe = False
 setup_requires =
     setuptools_scm
 install_requires =
+    packaging
     numpy
     astropy>=2
 python_requires = >=3.6