chore(exhale): remove outdated compatibility

exhale/configs.py

@@ -51,12 +51,7 @@
 from sphinx.util import logging
 from types import FunctionType, ModuleType
 
-try:
-    # Python 2 StringIO
-    from cStringIO import StringIO
-except ImportError:
-    # Python 3 StringIO
-    from io import StringIO
+from io import StringIO
 
 
 logger = logging.getLogger(__name__)

exhale/graph.py

@@ -23,13 +23,7 @@
 import textwrap
 
 from bs4 import BeautifulSoup
-
-try:
-    # Python 2 StringIO
-    from cStringIO import StringIO
-except ImportError:
-    # Python 3 StringIO
-    from io import StringIO
+from io import StringIO
 
 __all__       = ["ExhaleRoot", "ExhaleNode"]
 
@@ -4038,11 +4032,7 @@ class view hierarchy.  It will be present in the file page it was declared in
         - Directories
         - Files
         '''
-        try:
-            from collections.abc import MutableMapping
-        except ImportError:
-            # TODO: remove when dropping python 2.7
-            from collections import MutableMapping
+        from collections.abc import MutableMapping
         class UnabridgedDict(MutableMapping):
             def __init__(self):
                 self.items = {}

exhale/utils.py

@@ -98,11 +98,7 @@ def time_string(start, end):
 
 
 def get_time():
-    if sys.version_info > (3, 3):
-        # monotonic introduced in 3.3
-        return time.monotonic()
-    else:
-        return time.time()
+    return time.monotonic()
 
 
 AVAILABLE_KINDS = [

testing/utils.py

@@ -10,11 +10,7 @@
 """
 
 from __future__ import unicode_literals
-try:
-    from collections.abc import Mapping
-except ImportError:
-    # TODO: remove when dropping python 2.7
-    from collections import Mapping
+from collections.abc import Mapping
 
 
 def deep_update(orig, override):