diff --git a/coub-dl.py b/coub-dl.py
index 1ce16c4..26c18f7 100644
--- a/coub-dl.py
+++ b/coub-dl.py
@@ -38,13 +38,13 @@ def print_opt(*args, **kwargs):
         print(*args, **kwargs)
 
 
-def getCmdStdErr(command):
+def get_command_stderr(command):
     process = Popen(command, stderr=PIPE, stdout=PIPE)
     out, err = process.communicate()
     return err
 
 
-def getDuration(ffprobe_output):
+def get_duration(ffprobe_output):
     durationPattern = r'.*Duration:\s(.+),\sstart.*'
     regex = match(durationPattern, str(ffprobe_output))
     duration = regex.groups()[0] if regex else None
@@ -70,7 +70,7 @@ def download_video_stream():
          stdout=DEVNULL, stderr=DEVNULL)
 
 
-def readExtensions():
+def read_extensions():
     for file in listdir():
         for filename in FILES:
             if match('^{}.*'.format(FILES[filename]), file):
@@ -171,11 +171,11 @@ if exists(FILES[File.OUTPUT]):
 # download streams and update FILE dict with extensions
 download_audio_stream()
 download_video_stream()
-readExtensions()
+read_extensions()
 
 # get stream lengths via ffprobe
-audioData= getDuration(getCmdStdErr(('ffprobe', FILES[Stream.AUDIO]))).split(':')
-videoData = getDuration(getCmdStdErr(('ffprobe', FILES[Stream.VIDEO]))).split(':')
+audioData= get_duration(get_command_stderr(('ffprobe', FILES[Stream.AUDIO]))).split(':')
+videoData = get_duration(get_command_stderr(('ffprobe', FILES[Stream.VIDEO]))).split(':')
 
 audioLen = timedelta(hours=float(audioData[0]), minutes=float(audioData[1]), seconds=float(audioData[2]))
 videoLen = timedelta(hours=float(videoData[0]), minutes=float(videoData[1]), seconds=float(videoData[2]))