diff --git a/algorithms/2_BubbleSort/bubble_sort_exercise_solution.py b/algorithms/2_BubbleSort/bubble_sort_exercise_solution.py
index df838f7..6e8c7f9 100644
--- a/algorithms/2_BubbleSort/bubble_sort_exercise_solution.py
+++ b/algorithms/2_BubbleSort/bubble_sort_exercise_solution.py
@@ -3,8 +3,15 @@ def bubble_sort(elements, key=None):
size = len(elements)
for i in range(size-1):
+ if key is None:
+ print("please enter a key to start search.")
+ break
swapped = False
+ breakloop =False
for j in range(size-1-i):
+ if key not in elements[j]:
+ breakloop = True
+ break
a = elements[j][key]
b = elements[j+1][key]
if a > b:
@@ -12,6 +19,10 @@ def bubble_sort(elements, key=None):
elements[j] = elements[j+1]
elements[j+1] = tmp
swapped = True
+
+ if breakloop:
+ print("key is not correct")
+ break
if not swapped:
break
@@ -25,4 +36,4 @@ def bubble_sort(elements, key=None):
]
bubble_sort(elements, key='transaction_amount')
- print(elements)
\ No newline at end of file
+ print(elements)
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