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321b1425e3
* Update __init__.py please add a function to get length of linked list * Update __init__.py * Update doubly_linked_list.py all size function lo doubly linked list class * prime number _better method * comments * Updated init.py 2 made it more pythonic * updated length function * commnet in linked_list construtor * Update data_structures/linked_list/__init__.py accepecting changes Co-authored-by: Christian Clauss <cclauss@me.com> * Update data_structures/linked_list/__init__.py Co-authored-by: Christian Clauss <cclauss@me.com> * Update __init__.py * Revert changes to doubly_linked_list.py * Revert changes to prime_check.py Co-authored-by: Christian Clauss <cclauss@me.com>
47 lines
998 B
Python
47 lines
998 B
Python
class Node:
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def __init__(self, item, next):
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self.item = item
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self.next = next
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class LinkedList:
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def __init__(self):
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self.head = None
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self.size = 0
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def add(self, item):
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self.head = Node(item, self.head)
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self.size += 1
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def remove(self):
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if self.is_empty():
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return None
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else:
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item = self.head.item
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self.head = self.head.next
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self.size -= 1
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return item
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def is_empty(self):
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return self.head is None
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def __len__(self):
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"""
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>>> linked_list = LinkedList()
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>>> len(linked_list)
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0
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>>> linked_list.add("a")
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>>> len(linked_list)
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1
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>>> linked_list.add("b")
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>>> len(linked_list)
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2
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>>> _ = linked_list.remove()
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>>> len(linked_list)
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1
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>>> _ = linked_list.remove()
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>>> len(linked_list)
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0
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"""
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return self.size
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