Address errors, improvements, formatting

- Removed unused code not portable due to buffer() use
- raw_input() does not exist in Python 3
- Fixed octal constant syntax for Python 3
- Fixed TypeError
- Replace if not exists: makedirs(path) with single call: using makedirs(path, exist_ok=True)
- Class inherits from object, can be safely removed from bases in python3: pylint's useless-object-inheritance (W0235) check

Signed-off-by: JoeLametta <JoeLametta@users.noreply.github.com>

whipper/common/directory.py

@@ -19,14 +19,13 @@
 # along with whipper.  If not, see <http://www.gnu.org/licenses/>.
 
 from os import getenv, makedirs
-from os.path import join, expanduser, exists
+from os.path import join, expanduser
 
 
 def config_path():
     path = join(getenv('XDG_CONFIG_HOME') or join(expanduser('~'), '.config'),
                 'whipper')
-    if not exists(path):
-        makedirs(path)
+    makedirs(path, exist_ok=True)
     return join(path, 'whipper.conf')
 
 
@@ -35,8 +34,7 @@ def cache_path(name=None):
                 'whipper')
     if name:
         path = join(path, name)
-    if not exists(path):
-        makedirs(path)
+    makedirs(path, exist_ok=True)
     return path
 
 
@@ -46,6 +44,5 @@ def data_path(name=None):
                 'whipper')
     if name:
         path = join(path, name)
-    if not exists(path):
-        makedirs(path)
+    makedirs(path, exist_ok=True)
     return path