Circular Buffer in Python Part 3

circular_buffer.py

def enqueue(self, item):
    """Insert an item at the back of the CircularBuffer
    Runtime: O(1) Space: O(1)"""
    if self.is_full():
        raise OverflowError(
            "CircularBuffer is full, unable to enqueue item")
    self.buffer[self.tail] = item
    self.tail = (self.tail + 1) % self.max_size

def dequeue(self):
    """Return the item at the front of the Circular Buffer and remove it
    Runtime: O(1) Space: O(1)"""
    if self.is_empty():
        raise IndexError("CircularBuffer is empty, unable to dequeue")
    item = self.buffer[self.head]
    self.buffer[self.head] = None
    self.head = (self.head + 1) % self.max_size
    return item
    
def front(self):
    """Return the item at the front of the CircularBuffer
    Runtime: O(1) Space: O(1)"""
    return self.buffer[self.head]