diff --git a/geojson/geometry.py b/geojson/geometry.py
index ccf596c..883cebf 100644
--- a/geojson/geometry.py
+++ b/geojson/geometry.py
@@ -1,17 +1,9 @@
-import sys
 from decimal import Decimal
 from numbers import Number
 
 from geojson.base import GeoJSON
 
 
-if sys.version_info[0] == 3:
-    # Python 3.x has no long type
-    _JSON_compliant_types = (float, int, Decimal)
-else:
-    _JSON_compliant_types = (float, int, Decimal, long)  # noqa
-
-
 class Geometry(GeoJSON):
     """
     Represents an abstract base class for a WGS84 geometry.
@@ -50,7 +42,7 @@ def clean_coordinates(cls, coords, precision):
                 new_coords.append(cls.clean_coordinates(coord, precision))
             elif isinstance(coord, Geometry):
                 new_coords.append(coord['coordinates'])
-            elif isinstance(coord, _JSON_compliant_types):
+            elif isinstance(coord, (float, int, Decimal)):
                 new_coords.append(round(coord, precision))
             else:
                 raise ValueError("%r is not a JSON compliant number" % coord)
diff --git a/geojson/mapping.py b/geojson/mapping.py
index 80c410c..1ceffbc 100644
--- a/geojson/mapping.py
+++ b/geojson/mapping.py
@@ -1,7 +1,4 @@
-try:
-    from collections.abc import MutableMapping
-except ImportError:
-    from collections import MutableMapping
+from collections.abc import MutableMapping
 
 try:
     import simplejson as json
diff --git a/geojson/utils.py b/geojson/utils.py
index 93b5222..5fb5f2e 100644
--- a/geojson/utils.py
+++ b/geojson/utils.py
@@ -13,8 +13,6 @@ def coords(obj):
     # Handle recursive case first
     if 'features' in obj:  # FeatureCollection
         for f in obj['features']:
-            # For Python 2 compatibility
-            # See https://www.reddit.com/r/learnpython/comments/4rc15s/yield_from_and_python_27/ # noqa: E501
             yield from coords(f)
     elif 'geometry' in obj:  # Feature
         yield from coords(obj['geometry'])
diff --git a/setup.py b/setup.py
index 99ea3d0..eeee95a 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,3 @@
-import io
 from setuptools import setup
 import sys
 import re
@@ -19,10 +18,7 @@
 
 def test_suite():
     import doctest
-    try:
-        import unittest2 as unittest
-    except ImportError:
-        import unittest
+    import unittest
 
     suite = unittest.TestLoader().discover("tests")
     suite.addTest(doctest.DocFileSuite("README.rst"))
diff --git a/tests/test_features.py b/tests/test_features.py
index d833cdd..77477e3 100644
--- a/tests/test_features.py
+++ b/tests/test_features.py
@@ -1,7 +1,4 @@
-try:
-    from StringIO import StringIO
-except ImportError:
-    from io import StringIO
+from io import StringIO
 import unittest
 
 import geojson