Move files to separate directories

sorts/bubble_sort.py

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+"""
+This is pure python implementation of bubble sort algorithm
+
+For doctests run following command:
+python -m doctest -v bubble_sort.py
+or
+python3 -m doctest -v bubble_sort.py
+
+For manual testing run:
+python bubble_sort.py
+"""
+from __future__ import print_function
+
+
+def bubble_sort(collection):
+    """Pure implementation of bubble sort algorithm in Python
+
+    :param collection: some mutable ordered collection with heterogeneous
+    comparable items inside
+    :return: the same collection ordered by ascending
+
+    Examples:
+    >>> bubble_sort([0, 5, 3, 2, 2])
+    [0, 2, 2, 3, 5]
+
+    >>> bubble_sort([])
+    []
+
+    >>> bubble_sort([-2, -5, -45])
+    [-45, -5, -2]
+    """
+    length = len(collection)
+    for i in range(length):
+        for j in range(length-1):
+            if collection[j] > collection[j+1]:
+                collection[j], collection[j+1] = collection[j+1], collection[j]
+
+    return collection
+
+
+if __name__ == '__main__':
+    import sys
+    # For python 2.x and 3.x compatibility: 3.x has not raw_input builtin
+    # otherwise 2.x's input builtin function is too "smart"
+    if sys.version_info.major < 3:
+        input_function = raw_input
+    else:
+        input_function = input
+
+    user_input = input_function('Enter numbers separated by coma:\n')
+    unsorted = [int(item) for item in user_input.split(',')]
+    print(bubble_sort(unsorted))