/
singly_linked_list.py
58 lines (47 loc) · 1.46 KB
/
singly_linked_list.py
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class SList:
def __init__(self):
self.root = None
self.size = 0
def insert(self, item):
if not item:
raise ValueError('Cannot add None item to a list')
self.size += 1
if self.root is None:
self.root = Node(item)
else:
p = Node(item)
p.next = self.root
self.root = p
"""Remove the element at the specific index"""
def remove(self, index):
if index < 0 or index >= self.size:
raise ValueError('Index cannot be negative or greater than the size of the list')
current = self.root
if index == 0:
self.root = self.root.next
else:
for _ in range(index - 1):
current = current.next
p = current.next.next
if p is not None:
current.next = p
else:
current.next = None
self.size -= 1
def __len__(self):
return self.size
def __repr__(self):
return "[{}]".format(", ".join(map(str, self)))
def __iter__(self):
current = self.root
while current is not None:
yield current
current = current.next
class Node:
def __init__(self, data):
if data is None:
raise ValueError('Node cannot be instantiated without an item')
self.data = data
self.next = None
def __repr__(self):
return str(self.data)