Consolidate bubble sort iterative and recursive (#10651)

* Consolidate bubble sort iterative and recursive

* Update sorts/bubble_sort.py

Co-authored-by: Christian Clauss <cclauss@me.com>

* Refactor bubble sort func signature, doctest, timer

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update bubble_sort.py

---------

Co-authored-by: Christian Clauss <cclauss@me.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: 3 people

sorts/bubble_sort.py

@@ -1,33 +1,45 @@
 from typing import Any
 
 
-def bubble_sort(collection: list[Any]) -> list[Any]:
+def bubble_sort_iterative(collection: list[Any]) -> list[Any]:
     """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, 2, 3, 2])
+    >>> bubble_sort_iterative([0, 5, 2, 3, 2])
     [0, 2, 2, 3, 5]
-    >>> bubble_sort([0, 5, 2, 3, 2]) == sorted([0, 5, 2, 3, 2])
+    >>> bubble_sort_iterative([])
+    []
+    >>> bubble_sort_iterative([-2, -45, -5])
+    [-45, -5, -2]
+    >>> bubble_sort_iterative([-23, 0, 6, -4, 34])
+    [-23, -4, 0, 6, 34]
+    >>> bubble_sort_iterative([0, 5, 2, 3, 2]) == sorted([0, 5, 2, 3, 2])
     True
-    >>> bubble_sort([]) == sorted([])
+    >>> bubble_sort_iterative([]) == sorted([])
     True
-    >>> bubble_sort([-2, -45, -5]) == sorted([-2, -45, -5])
+    >>> bubble_sort_iterative([-2, -45, -5]) == sorted([-2, -45, -5])
     True
-    >>> bubble_sort([-23, 0, 6, -4, 34]) == sorted([-23, 0, 6, -4, 34])
+    >>> bubble_sort_iterative([-23, 0, 6, -4, 34]) == sorted([-23, 0, 6, -4, 34])
     True
-    >>> bubble_sort(['d', 'a', 'b', 'e', 'c']) == sorted(['d', 'a', 'b', 'e', 'c'])
+    >>> bubble_sort_iterative(['d', 'a', 'b', 'e']) == sorted(['d', 'a', 'b', 'e'])
     True
+    >>> bubble_sort_iterative(['z', 'a', 'y', 'b', 'x', 'c'])
+    ['a', 'b', 'c', 'x', 'y', 'z']
+    >>> bubble_sort_iterative([1.1, 3.3, 5.5, 7.7, 2.2, 4.4, 6.6])
+    [1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7]
+    >>> bubble_sort_iterative([1, 3.3, 5, 7.7, 2, 4.4, 6])
+    [1, 2, 3.3, 4.4, 5, 6, 7.7]
     >>> import random
-    >>> collection = random.sample(range(-50, 50), 100)
-    >>> bubble_sort(collection) == sorted(collection)
+    >>> collection_arg = random.sample(range(-50, 50), 100)
+    >>> bubble_sort_iterative(collection_arg) == sorted(collection_arg)
     True
     >>> import string
-    >>> collection = random.choices(string.ascii_letters + string.digits, k=100)
-    >>> bubble_sort(collection) == sorted(collection)
+    >>> collection_arg = random.choices(string.ascii_letters + string.digits, k=100)
+    >>> bubble_sort_iterative(collection_arg) == sorted(collection_arg)
     True
     """
     length = len(collection)
@@ -42,14 +54,77 @@ def bubble_sort(collection: list[Any]) -> list[Any]:
     return collection
 
 
+def bubble_sort_recursive(collection: list[Any]) -> list[Any]:
+    """It is similar iterative bubble sort but recursive.
+
+    :param collection: mutable ordered sequence of elements
+    :return: the same list in ascending order
+
+    Examples:
+    >>> bubble_sort_recursive([0, 5, 2, 3, 2])
+    [0, 2, 2, 3, 5]
+    >>> bubble_sort_iterative([])
+    []
+    >>> bubble_sort_recursive([-2, -45, -5])
+    [-45, -5, -2]
+    >>> bubble_sort_recursive([-23, 0, 6, -4, 34])
+    [-23, -4, 0, 6, 34]
+    >>> bubble_sort_recursive([0, 5, 2, 3, 2]) == sorted([0, 5, 2, 3, 2])
+    True
+    >>> bubble_sort_recursive([]) == sorted([])
+    True
+    >>> bubble_sort_recursive([-2, -45, -5]) == sorted([-2, -45, -5])
+    True
+    >>> bubble_sort_recursive([-23, 0, 6, -4, 34]) == sorted([-23, 0, 6, -4, 34])
+    True
+    >>> bubble_sort_recursive(['d', 'a', 'b', 'e']) == sorted(['d', 'a', 'b', 'e'])
+    True
+    >>> bubble_sort_recursive(['z', 'a', 'y', 'b', 'x', 'c'])
+    ['a', 'b', 'c', 'x', 'y', 'z']
+    >>> bubble_sort_recursive([1.1, 3.3, 5.5, 7.7, 2.2, 4.4, 6.6])
+    [1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7]
+    >>> bubble_sort_recursive([1, 3.3, 5, 7.7, 2, 4.4, 6])
+    [1, 2, 3.3, 4.4, 5, 6, 7.7]
+    >>> import random
+    >>> collection_arg = random.sample(range(-50, 50), 100)
+    >>> bubble_sort_recursive(collection_arg) == sorted(collection_arg)
+    True
+    >>> import string
+    >>> collection_arg = random.choices(string.ascii_letters + string.digits, k=100)
+    >>> bubble_sort_recursive(collection_arg) == sorted(collection_arg)
+    True
+    """
+    length = len(collection)
+    swapped = False
+    for i in range(length - 1):
+        if collection[i] > collection[i + 1]:
+            collection[i], collection[i + 1] = collection[i + 1], collection[i]
+            swapped = True
+
+    return collection if not swapped else bubble_sort_recursive(collection)
+
+
 if __name__ == "__main__":
     import doctest
-    import time
+    from random import sample
+    from timeit import timeit
 
     doctest.testmod()
 
-    user_input = input("Enter numbers separated by a comma:").strip()
-    unsorted = [int(item) for item in user_input.split(",")]
-    start = time.process_time()
-    print(*bubble_sort(unsorted), sep=",")
-    print(f"Processing time: {(time.process_time() - start)%1e9 + 7}")
+    # Benchmark: Iterative seems slightly faster than recursive.
+    num_runs = 10_000
+    unsorted = sample(range(-50, 50), 100)
+    timer_iterative = timeit(
+        "bubble_sort_iterative(unsorted[:])", globals=globals(), number=num_runs
+    )
+    print("\nIterative bubble sort:")
+    print(*bubble_sort_iterative(unsorted), sep=",")
+    print(f"Processing time (iterative): {timer_iterative:.5f}s for {num_runs:,} runs")
+
+    unsorted = sample(range(-50, 50), 100)
+    timer_recursive = timeit(
+        "bubble_sort_recursive(unsorted[:])", globals=globals(), number=num_runs
+    )
+    print("\nRecursive bubble sort:")
+    print(*bubble_sort_recursive(unsorted), sep=",")
+    print(f"Processing time (recursive): {timer_recursive:.5f}s for {num_runs:,} runs")