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Fix AttributeError in dequeue_cat and dequeue_dog methods #270

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Fix AttributeError in dequeue_cat and dequeue_dog methods #270

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10 changes: 8 additions & 2 deletions chapter_03/p06_animal_shelter.py
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,10 @@ def dequeue_cat(self):
current_node = self.head
while current_node is not None:
if isinstance(current_node.data, Cat):
previous_node.next_node = current_node.next_node
if previous_node is None:
self.head = current_node.next_node
else:
previous_node.next_node = current_node.next_node
return current_node.data
previous_node = current_node
current_node = current_node.next_node
Expand All @@ -81,7 +84,10 @@ def dequeue_dog(self):
current_node = self.head
while current_node is not None:
if isinstance(current_node.data, Dog):
previous_node.next_node = current_node.next_node
if previous_node is None:
self.head = current_node.next_node
else:
previous_node.next_node = current_node.next_node
return current_node.data
previous_node = current_node
current_node = current_node.next_node
Expand Down