diff --git a/nava/functions.py b/nava/functions.py
index 271328f..ab98c52 100644
--- a/nava/functions.py
+++ b/nava/functions.py
@@ -12,6 +12,7 @@
 from .errors import NavaBaseError
 from . import params
 
+
 def stop(sound_id):
     """
     Stop sound.
@@ -22,6 +23,7 @@ def stop(sound_id):
     """
     params._play_threads_map[sound_id].stop()
 
+
 def stop_all():
     """
     Stop all sounds.
@@ -31,16 +33,18 @@ def stop_all():
     for thread in params._play_threads_map.values():
         thread.stop()
 
+
 def sound_id_gen():
     """
     Sound id generator.
 
     :return: sound id as int
     """
-    params._play_threads_counter +=1
+    params._play_threads_counter += 1
     sound_id = params._play_threads_counter + 1000
     return sound_id
 
+
 def nava_help():
     """
     Print nava details.
@@ -75,6 +79,7 @@ def quoter(sound_path, *args, **kwargs):
         return func(sound_path, *args, **kwargs)
     return quoter
 
+
 def __play_win(sound_path, async_mode=True):
     """
     Play sound in Windows.
@@ -125,8 +130,8 @@ def __play_linux(sound_path, async_mode=True):
     """
     if async_mode:
         sound_thread = NavaThread(target=__play_sync_linux,
-                                        args=(sound_path,),
-                                        daemon=True)
+                                  args=(sound_path,),
+                                  daemon=True)
         sound_thread.start()
         sound_id = sound_id_gen()
         params._play_threads_map[sound_id] = sound_thread
@@ -144,7 +149,7 @@ def __play_sync_linux(sound_path):
     :return: process
     """
     proc = subprocess.Popen(["aplay",
-                            sound_path],
+                             sound_path],
                             shell=False,
                             stderr=subprocess.PIPE,
                             stdin=subprocess.PIPE,
@@ -152,7 +157,6 @@ def __play_sync_linux(sound_path):
     return proc
 
 
-
 @quote
 def __play_mac(sound_path, async_mode=True):
     """
@@ -166,8 +170,8 @@ def __play_mac(sound_path, async_mode=True):
     """
     if async_mode:
         sound_thread = NavaThread(target=__play_sync_mac,
-                                        args=(sound_path,),
-                                        daemon=True)
+                                  args=(sound_path,),
+                                  daemon=True)
         sound_thread.start()
         sound_id = sound_id_gen()
         params._play_threads_map[sound_id] = sound_thread
@@ -185,11 +189,11 @@ def __play_sync_mac(sound_path):
     :return: process
     """
     proc = subprocess.Popen(["afplay",
-                               sound_path],
-                              shell=False,
-                              stderr=subprocess.PIPE,
-                              stdin=subprocess.PIPE,
-                              stdout=subprocess.PIPE)
+                             sound_path],
+                            shell=False,
+                            stderr=subprocess.PIPE,
+                            stdin=subprocess.PIPE,
+                            stdout=subprocess.PIPE)
     return proc
 
 
@@ -240,5 +244,5 @@ def play(sound_path, async_mode=True):
             return __play_mac(sound_path, async_mode)
         else:
             return __play_linux(sound_path, async_mode)
-    except Exception: # pragma: no cover
+    except Exception:  # pragma: no cover
         raise NavaBaseError(SOUND_FILE_PLAY_ERROR)
diff --git a/nava/params.py b/nava/params.py
index c6c26a7..2ca956f 100644
--- a/nava/params.py
+++ b/nava/params.py
@@ -13,4 +13,4 @@
 SOUND_FILE_PATH_TYPE_ERROR = "Sound file's path should be a string."
 
 _play_threads_map = dict()
-_play_threads_counter = 0
\ No newline at end of file
+_play_threads_counter = 0
diff --git a/nava/thread.py b/nava/thread.py
index 310c1ea..3395bbd 100644
--- a/nava/thread.py
+++ b/nava/thread.py
@@ -9,6 +9,7 @@ class NavaThread(threading.Thread):
     """
     Nava custom thread.
     """
+
     def __init__(self, *args, **kwargs):
         """
         Init method.
@@ -43,4 +44,4 @@ def stop(self):
         else:
             if self.play_process is not None:
                 self.play_process.kill()
-                self.play_process.terminate()
\ No newline at end of file
+                self.play_process.terminate()