Python Linked List: Create a singly linked list, append some items and iterate through the list
Python Linked List: Exercise-1 with Solution
Write a Python program to create a singly linked list, append some items and iterate through the list.
Sample Solution:-
Python Code:
class Node:
# Singly linked node
def __init__(self, data=None):
self.data = data
self.next = None
class singly_linked_list:
def __init__(self):
# Createe an empty list
self.head = None
self.tail = None
self.count = 0
def iterate_item(self):
# Iterate the list.
current_item = self.head
while current_item:
val = current_item.data
current_item = current_item.next
yield val
def append_item(self, data):
#Append items on the list
node = Node(data)
if self.tail:
self.tail.next = node
self.tail = node
else:
self.head = node
self.tail = node
self.count += 1
items = singly_linked_list()
items.append_item('PHP')
items.append_item('Python')
items.append_item('C#')
items.append_item('C++')
items.append_item('Java')
for val in items.iterate_item():
print(val)
print("\nhead.data: ",items.head.data)
print("tail.data: ",items.tail.data)
Sample Output:
PHP Python C# C++ Java head.data: PHP tail.data: Java
Flowchart:
Python Code Editor:
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Python: Tips of the Day
Creates a dictionary with the same keys as the provided dictionary and values generated by running the provided function for each value:
Example:
def tips_map_values(obj, fn): ret = {} for key in obj.keys(): ret[key] = fn(obj[key]) return ret users = { 'Owen': { 'user': 'Owen', 'age': 29 }, 'Eddie': { 'user': 'Eddie', 'age': 15 } } print(tips_map_values(users, lambda u : u['age'])) # {'Owen': 29, 'Eddie': 15}
Output:
{'Owen': 29, 'Eddie': 15}
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