diff --git a/generator b/generator
index 2f70ed6..60cea15 100755
--- a/generator
+++ b/generator
@@ -22,80 +22,97 @@ from docopt import docopt
 from moviepy.editor import VideoFileClip
 from PIL import Image
 from click import progressbar
-import glob, os, random, shutil, math, tempfile
+import glob
+import os
+import random
+import shutil
+import math
+import tempfile
 
 
 TMP_FRAMES_PATH = tempfile.mkdtemp()
 
-def generate_video_thumbnail(args):
-    videoFileClip = VideoFileClip(args['<video>'])
+
+def generate_video_thumbnails(args):
+    filepath = args['<video>']
     interval = int(args['<interval>'])
     size = (int(args['<width>']), int(args['<height>']))
-    outputPrefix = get_output_prefix()
-    generate_frames(videoFileClip, interval, outputPrefix, size)
-
+    output_prefix = get_output_prefix()
     columns = int(args['<columns>'])
     output = args['<output>']
-    generate_sprite_from_frames(outputPrefix, columns, size, output)
 
-def generate_frames(videoFileClip, interval, outputPrefix, size):
-    print("Extracting", int(videoFileClip.duration / interval), "frames")
-    frameCount = 0
-    with progressbar(range(0, int(videoFileClip.duration), interval)) as items:
+    video_file_clip = VideoFileClip(filepath)
+    generate_frames(video_file_clip, interval, output_prefix, size)
+    generate_sprite_from_frames(output_prefix, columns, size, output)
+
+
+def generate_frames(video_file_clip, interval, output_prefix, size):
+    duration = video_file_clip.duration
+    print("Extracting", int(duration / interval), "frames")
+    frame_count = 0
+    with progressbar(range(0, int(duration), interval)) as items:
         for i in items:
-            extract_frame(videoFileClip, i, outputPrefix, size, frameCount)
-            frameCount += 1
+            extract_frame(video_file_clip, i, output_prefix, size, frame_count)
+            frame_count += 1
     print("Frames extracted.")
 
-def extract_frame(videoFileClip, moment, outputPrefix, size, frameCount):
-    output = outputPrefix + ("%05d.png" % frameCount)
-    videoFileClip.save_frame(output, t=int(moment))
+
+def extract_frame(video_file_clip, moment, output_prefix, size, frame_count):
+    output = output_prefix + ("%05d.png" % frame_count)
+    video_file_clip.save_frame(output, t=int(moment))
     resize_frame(output, size)
 
+
 def resize_frame(filename, size):
     image = Image.open(filename)
     image = image.resize(size, Image.ANTIALIAS)
     image.save(filename)
 
-def generate_sprite_from_frames(framesPath, columns, size, output):
-    framesMap = sorted(glob.glob(framesPath + "*.png"))
 
-    masterWidth = size[0] * columns
-    masterHeight = size[1] * int(math.ceil(float(len(framesMap)) / columns))
+def generate_sprite_from_frames(frames_path, columns, size, output):
+    frames_map = sorted(glob.glob(frames_path + "*.png"))
+
+    master_width = size[0] * columns
+    master_height = size[1] * int(math.ceil(float(len(frames_map)) / columns))
 
     line, column, mode = 0, 0, 'RGBA'
 
     try:
-        finalImage = Image.new(mode=mode, size=(masterWidth, masterHeight), color=(0,0,0,0))
-        finalImage.save(output)
+        final_image = Image.new(
+            mode=mode,
+            size=(master_width, master_height),
+            color=(0, 0, 0, 0)
+        )
+        final_image.save(output)
     except IOError:
         mode = 'RGB'
-        finalImage = Image.new(mode=mode, size=(masterWidth, masterHeight))
+        final_image = Image.new(mode=mode, size=(master_width, master_height))
 
-    for filename in framesMap:
-        with Image.open(filename) as image:              
+    for filename in frames_map:
+        with Image.open(filename) as image:
 
-            locationX = size[0] * column
-            locationY = size[1] * line
+            location_x = size[0] * column
+            location_y = size[1] * line
 
-            finalImage.paste(image, (locationX, locationY))
+            final_image.paste(image, (location_x, location_y))
 
             column += 1
-            
+
             if column == columns:
                 line += 1
                 column = 0
 
-    finalImage.save(output)
+    final_image.save(output)
     shutil.rmtree(TMP_FRAMES_PATH, ignore_errors=True)
     print("Saved!")
 
+
 def get_output_prefix():
     if not os.path.exists(TMP_FRAMES_PATH):
         os.makedirs(TMP_FRAMES_PATH)
     return TMP_FRAMES_PATH + os.sep + ("%032x_" % random.getrandbits(128))
 
+
 if __name__ == "__main__":
     arguments = docopt(__doc__, version='0.0.2')
-    generate_video_thumbnail(arguments)
-
+    generate_video_thumbnails(arguments)