diff --git a/AlphaGo/utils.py b/AlphaGo/utils.py
index d005c42..8075381 100644
--- a/AlphaGo/utils.py
+++ b/AlphaGo/utils.py
@@ -26,26 +26,32 @@ import go
 KGS_COLUMNS = 'ABCDEFGHJKLMNOPQRST'
 SGF_COLUMNS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
 
+
 def parse_sgf_to_flat(sgf):
     return flatten_coords(parse_sgf_coords(sgf))
 
+
 def flatten_coords(c):
     return go.N * c[0] + c[1]
 
+
 def unflatten_coords(f):
     return divmod(f, go.N)
 
+
 def parse_sgf_coords(s):
     'Interprets coords. aa is top left corner; sa is top right corner'
     if s is None or s == '':
         return None
     return SGF_COLUMNS.index(s[1]), SGF_COLUMNS.index(s[0])
 
+
 def unparse_sgf_coords(c):
     if c is None:
         return ''
     return SGF_COLUMNS[c[1]] + SGF_COLUMNS[c[0]]
 
+
 def parse_kgs_coords(s):
     'Interprets coords. A1 is bottom left; A9 is top left.'
     if s == 'pass':
@@ -55,17 +61,20 @@ def parse_kgs_coords(s):
     row_from_bottom = int(s[1:]) - 1
     return go.N - row_from_bottom - 1, col
 
+
 def parse_pygtp_coords(vertex):
     'Interprets coords. (1, 1) is bottom left; (1, 9) is top left.'
     if vertex in (gtp.PASS, gtp.RESIGN):
         return None
     return go.N - vertex[1], vertex[0] - 1
 
+
 def unparse_pygtp_coords(c):
     if c is None:
         return gtp.PASS
     return c[1] + 1, go.N - c[0]
 
+
 def parse_game_result(result):
     if re.match(r'[bB]\+', result):
         return go.BLACK
@@ -74,12 +83,15 @@ def parse_game_result(result):
     else:
         return None
 
+
 def product(numbers):
     return functools.reduce(operator.mul, numbers)
 
+
 def take_n(n, iterable):
     return list(itertools.islice(iterable, n))
 
+
 def iter_chunks(chunk_size, iterator):
     while True:
         next_chunk = take_n(chunk_size, iterator)
@@ -89,7 +101,8 @@ def iter_chunks(chunk_size, iterator):
         else:
             break
 
-def shuffler(iterator, pool_size=10**5, refill_threshold=0.9):
+
+def shuffler(iterator, pool_size=10 ** 5, refill_threshold=0.9):
     yields_between_refills = round(pool_size * (1 - refill_threshold))
     # initialize pool; this step may or may not exhaust the iterator.
     pool = take_n(pool_size, iterator)
@@ -102,18 +115,23 @@ def shuffler(iterator, pool_size=10**5, refill_threshold=0.9):
             break
         pool.extend(next_batch)
     # finish consuming whatever's left - no need for further randomization.
-    yield from pool
+    yield pool
+
 
 class timer(object):
     all_times = defaultdict(float)
+
     def __init__(self, label):
         self.label = label
+
     def __enter__(self):
         self.tick = time.time()
+
     def __exit__(self, type, value, traceback):
         self.tock = time.time()
         self.all_times[self.label] += self.tock - self.tick
+
     @classmethod
     def print_times(cls):
         for k, v in cls.all_times.items():
-            print("%s: %.3f" % (k, v))
\ No newline at end of file
+            print("%s: %.3f" % (k, v))