1 files changed, 17 insertions, 0 deletions
diff --git a/algorithms/impl/quicksort.py b/algorithms/impl/quicksort.py
index 1e835c4..dd0c92b 100644
--- a/algorithms/impl/quicksort.py
+++ b/algorithms/impl/quicksort.py
@@ -8,8 +8,10 @@ import sys
 
 from ..algorithm import SortingAlgorithm
 
+
 seed()
 
+
 def _partition(xs, beg, end, select_pivot):
     pivot = select_pivot(xs, beg, end)
     xs[pivot], xs[end] = xs[end], xs[pivot]
@@ -20,47 +22,59 @@ def _partition(xs, beg, end, select_pivot):
     xs[beg], xs[end] = xs[end], xs[beg]
     return beg
 
+
 def _quicksort(xs, beg, end, select_pivot):
     if beg < end:
         pivot = _partition(xs, beg, end, select_pivot)
         _quicksort(xs, beg, pivot - 1, select_pivot)
         _quicksort(xs, pivot + 1, end, select_pivot)
 
+
 def _select_first(xs, beg, end):
     return beg
 
+
 def _select_second(xs, beg, end):
     return beg + 1
 
+
 def _select_middle(xs, beg, end):
     return (beg + end) // 2
 
+
 def _select_last(xs, beg, end):
     return end
 
+
 def _select_random(xs, beg, end):
     return randrange(beg, end + 1)
 
+
 def quicksort_first(xs):
     _quicksort(xs, 0, len(xs) - 1, _select_first)
     return xs
 
+
 def quicksort_second(xs):
     _quicksort(xs, 0, len(xs) - 1, _select_second)
     return xs
 
+
 def quicksort_middle(xs):
     _quicksort(xs, 0, len(xs) - 1, _select_middle)
     return xs
 
+
 def quicksort_last(xs):
     _quicksort(xs, 0, len(xs) - 1, _select_last)
     return xs
 
+
 def quicksort_random(xs):
     _quicksort(xs, 0, len(xs) - 1, _select_random)
     return xs
 
+
 _ALGORITHMS = [
     SortingAlgorithm('quicksort_first', 'Quicksort (first element as pivot)', quicksort_first),
     SortingAlgorithm('quicksort_second', 'Quicksort (second element as pivot)', quicksort_second),
@@ -69,11 +83,13 @@ _ALGORITHMS = [
     SortingAlgorithm('quicksort_random', 'Quicksort (random element as pivot)', quicksort_random),
 ]
 
+
 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(quicksort_first(list(xs)))
@@ -82,5 +98,6 @@ def main(args=None):
     print(quicksort_last(list(xs)))
     print(quicksort_random(list(xs)))
 
+
 if __name__ == '__main__':
     main()