Initial python3 changes

Mostly just updating libraries, removing string encoding/decoding,
fixing some edge cases. No new functionality was added in this
commit.

lib/pkg_resources/tests/test_find_distributions.py

@@ -0,0 +1,43 @@
+import py
+import pytest
+import pkg_resources
+
+
+TESTS_DATA_DIR = py.path.local(__file__).dirpath('data')
+
+
+class TestFindDistributions:
+
+    @pytest.fixture
+    def target_dir(self, tmpdir):
+        target_dir = tmpdir.mkdir('target')
+        # place a .egg named directory in the target that is not an egg:
+        target_dir.mkdir('not.an.egg')
+        return target_dir
+
+    def test_non_egg_dir_named_egg(self, target_dir):
+        dists = pkg_resources.find_distributions(str(target_dir))
+        assert not list(dists)
+
+    def test_standalone_egg_directory(self, target_dir):
+        (TESTS_DATA_DIR / 'my-test-package_unpacked-egg').copy(target_dir)
+        dists = pkg_resources.find_distributions(str(target_dir))
+        assert [dist.project_name for dist in dists] == ['my-test-package']
+        dists = pkg_resources.find_distributions(str(target_dir), only=True)
+        assert not list(dists)
+
+    def test_zipped_egg(self, target_dir):
+        (TESTS_DATA_DIR / 'my-test-package_zipped-egg').copy(target_dir)
+        dists = pkg_resources.find_distributions(str(target_dir))
+        assert [dist.project_name for dist in dists] == ['my-test-package']
+        dists = pkg_resources.find_distributions(str(target_dir), only=True)
+        assert not list(dists)
+
+    def test_zipped_sdist_one_level_removed(self, target_dir):
+        (TESTS_DATA_DIR / 'my-test-package-zip').copy(target_dir)
+        dists = pkg_resources.find_distributions(
+            str(target_dir / "my-test-package.zip"))
+        assert [dist.project_name for dist in dists] == ['my-test-package']
+        dists = pkg_resources.find_distributions(
+            str(target_dir / "my-test-package.zip"), only=True)
+        assert not list(dists)