fix warnings due to PEP 420

python/setup.py.in

@@ -1,19 +1,17 @@
 """Setup file to install the GTSAM package."""
 
-try:
-    from setuptools import setup, find_packages
-except ImportError:
-    from distutils.core import setup, find_packages
+from setuptools import setup, find_namespace_packages
 
-packages = find_packages(where=".")
+packages = find_namespace_packages(
+    where=".",
+    exclude=('build', 'build.*', 'CMakeFiles', 'CMakeFiles.*',
+             'gtsam.notebooks', '*.preamble', '*.specializations', 'dist'))
 print("PACKAGES: ", packages)
 
 package_data = {
     '': [
         "./*.so",
-        "./*.dll",
-        "Data/*"  # Add the data files to the package
-        "Data/**/*"  # Add the data files in subdirectories
+        "./*.dll"
     ]
 }
 
@@ -41,7 +39,6 @@ setup(
         'Operating System :: Microsoft :: Windows',
         'Operating System :: POSIX',
         'License :: OSI Approved :: BSD License',
-        'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 3',
     ],
     packages=packages,