1 files changed, 56 insertions, 0 deletions
diff --git a/algorithms/impl/bubble_sort.py b/algorithms/impl/bubble_sort.py
new file mode 100644
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+++ b/algorithms/impl/bubble_sort.py
@@ -0,0 +1,56 @@
+# Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "Sorting algorithms" project.
+# For details, see https://github.com/egor-tensin/sorting-algorithms.
+# Distributed under the MIT License.
+
+import sys
+
+from ..algorithm import SortingAlgorithm
+
+
+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
+
+
+_ALGORITHMS = [
+    SortingAlgorithm('bubble_sort', 'Bubble sort', bubble_sort),
+    SortingAlgorithm('bubble_sort_optimized', 'Bubble sort (optimized)', bubble_sort_optimized),
+]
+
+
+def _parse_args(args=None):
+    if args is None:
+        args = sys.argv[1:]
+    return list(map(int, args))
+
+
+def main(args=None):
+    xs = _parse_args(args)
+    print(bubble_sort(list(xs)))
+    print(bubble_sort_optimized(list(xs)))
+
+
+if __name__ == '__main__':
+    main()