Tanya – Pine #37
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Tanya – Pine #37
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kyra-patton
reviewed
Jun 14, 2022
| @@ -15,47 +15,81 @@ def __init__(self): | |||
| self.front = -1 | |||
| self.rear = -1 | |||
| self.size = 0 | |||
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| def enqueue(self, element): | |||
| self.rear = (self.rear + 1) % self.buffer_size | ||
| self.store[self.rear] = element | ||
| self.size += 1 | ||
| return None | ||
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| def dequeue(self): |
| self.front = (self.front + 1) % self.buffer_size | ||
| self.size -= 1 | ||
| return temp | ||
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| def front(self): |
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| def front(self): | ||
| """ Returns an element from the front | ||
| of the Queue and None if the Queue | ||
| is empty. Does not remove anything. | ||
| """ | ||
| pass | ||
| return self.front | ||
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| def size(self): |
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| def size(self): | ||
| """ Returns the number of elements in | ||
| The Queue | ||
| """ | ||
| pass | ||
| return self.size | ||
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| def empty(self): |
| if self.size == 0: | ||
| return True | ||
| else: | ||
| return False | ||
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| def __str__(self): |
| @@ -12,7 +12,7 @@ def push(self, element): | |||
| """ Adds an element to the top of the Stack. | |||
| Returns None | |||
| """ | |||
| pass | |||
| self.store.add_first(element) | |||
| @@ -12,7 +12,7 @@ def push(self, element): | |||
| """ Adds an element to the top of the Stack. | |||
| Returns None | |||
| """ | |||
| pass | |||
| self.store.add_first(element) | |||
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| def pop(self): | |||
| @@ -21,18 +21,19 @@ def pop(self): | |||
| The Stack is empty. | |||
| returns None | |||
| """ | |||
| pass | |||
| return self.store.remove_first() | |||
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| def empty(self): | |||
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| def __str__(self): | ||
| """ Returns the Stack in String form like: | ||
| [3, 4, 7] | ||
| Starting with the top of the Stack and | ||
| ending with the bottom of the Stack. | ||
| """ | ||
| pass | ||
| return self.store.__str__() |
There was a problem hiding this comment.
Defining the __str__ method in a class is what we call operator overloading -- Python will convert any object to a string with the str() method by default, but it may not always be what we want. By defining the __str__ method, we can overwrite Python's default behavior to behavior that we want. However, when we call the overloaded method on an instance of the class, we do not need the dunders, we can just say str(object_instance)
Suggested change
| return self.store.__str__() | |
| return str(self.store) |
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Stacks and Queues
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Comprehension Questions
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