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diff --git a/bubble_sort.py b/bubble_sort.py
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+# Copyright 2015 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is licensed under the terms of the MIT License.
+# See LICENSE.txt for details.
+
+def bubble_sort(xs):
+    while True:
+        swapped = False
+        for i in range(1, len(xs)):
+            if xs[i - 1] > xs[i]:
+                xs[i], xs[i - 1] = xs[i - 1], xs[i]
+                swapped = True
+        if not swapped:
+            break
+    return xs
+
+def bubble_sort_optimized(xs):
+    n  = len(xs)
+    while True:
+        new_n = 0
+        for i in range(1, n):
+            if xs[i - 1] > xs[i]:
+                xs[i], xs[i - 1] = xs[i - 1], xs[i]
+                new_n = i
+        n = new_n
+        if not n:
+            break
+    return xs
+
+if __name__ == '__main__':
+    import sys
+    xs = list(map(int, sys.argv[1:]))
+    print(bubble_sort(list(xs)))
+    print(bubble_sort_optimized(list(xs)))