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data_structures/linked_list: Add __len__() function and tests (#2047)

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* 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>
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Lakshmikanth2001 2020-05-31 15:07:45 +05:30 committed by GitHub
parent 1e8fe8efcf
commit 321b1425e3
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data_structures/linked_list/__init__.py
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@ -7,9 +7,11 @@ class Node:
class LinkedList:
def __init__(self):
self.head = None
self.size = 0
def add(self, item):
self.head = Node(item, self.head)
self.size += 1
def remove(self):
if self.is_empty():
@ -17,7 +19,28 @@ class LinkedList:
else:
item = self.head.item
self.head = self.head.next
self.size -= 1
return item
def is_empty(self):
return self.head is None
def __len__(self):
"""
>>> linked_list = LinkedList()
>>> len(linked_list)
0
>>> linked_list.add("a")
>>> len(linked_list)
1
>>> linked_list.add("b")
>>> len(linked_list)
2
>>> _ = linked_list.remove()
>>> len(linked_list)
1
>>> _ = linked_list.remove()
>>> len(linked_list)
0
"""
return self.size