class Stack():
def __init__(self, size):
self.max_size = size
self.size = 0
self.storage = DoublyLinkedList()
def push(self, val):
if self.size >= self.max_size:
raise MemoryError("Stack is full")
self.storage.add(val)
self.size += 1
def pop(self):
if self.size > 0:
self.storage.remove_end()
self.size -= 1
return True
else:
return False
def peek(self):
if self.size > 0:
return self.storage.get_at_index(self.size - 1).value
def __str__(self):
val = self.storage.print_list(True)
var = val.split("\n")
final_val = ""
for x in range(len(var)):
final_val += var[len(var) - x - 1]
if x < len(var) - 1:
final_val += "\n"
return final_val
class Stack():
#Initialize the stack data using the doubly linked list we created before
def __init__(self):
self.data_list = DoublyLinkedList()
#Reference the sizeOf function from doubly linked lists
def sizeOf(self):
return self.data_list.sizeOf()
def isEmpty(self):
return self.sizeOf() == 0
#Add to the top of the stack
def push(self, elem):
self.data_list.add(elem)
#Remove from the top of the stack
def pop(self):
if self.isEmpty():
print('List is empty')
else:
self.data_list.removeLast()
#Peak at what is on the top of the stack
def stackPeak(self):
return self.data_list.peakLast()
class Queue:
def __init__(self, size=sys.maxsize):
self.max_size = size
self.storage = DoublyLinkedList()
self.size = 0
def enqueue(self, val):
if self.size >= self.max_size:
raise MemoryError("Queue is full")
self.storage.add(val)
self.size += 1
def dequeue(self):
if self.size < 1:
raise MemoryError("Queue is empty")
self.storage.remove_at_index(0)
self.size -= 1
def peek(self):
if self.size < 1:
return "None"
return self.storage.get_at_index(0).value
def __str__(self):
return self.storage.print_list(True)
def test_dll_add():
test_dll = DLL()
test_dll.add(1)
assert test_dll.head.data == 1
assert test_dll.tail.data == 1
test_dll.add(2)
assert test_dll.head.data == 1
assert test_dll.tail.data == 2
def test_filling(self):
llist = DoublyLinkedList()
s = 0
for i in range(10):
llist.add(i)
for i in range(10):
s += llist.remove_first()
self.assertEqual(0, len(llist))
self.assertEqual(45, s)
class TestDoublyLinkedList(TestLinkedList): # Override def setUp(self): self.test_list = DoublyLinkedList() def test_delete_node(self): first = self.test_list.add(3) second = self.test_list.add(2) self.assertEqual(2, self.test_list.size) self.test_list.remove_node(first) self.assertEqual(1, self.test_list.size) self.test_list.remove_node(second) self.assertEqual(0, self.test_list.size)
class Queue():
def __init__(self):
self.data = DoublyLinkedList()
def sizeOf(self):
return self.data.sizeOf()
def isEmpty(self):
return self.data.sizeOf() == 0
def peek(self):
return self.data.peakFirst()
def poll(self):
self.data.removeFirst()
def offer(self, val):
self.data.add(val)
def special_copy(DL1, DL2):
"""
This function should return a new doubly linked list which contains the same element of DL1 concatenated with
the elements of DL2 in reverse order.
Ex. DL1 = 4 <-> 5 <-> 6, DL2 = 9 <-> 4 <-> 6 >>> returns DL3 = 4 <-> 5 <-> 6 <-> 6 <-> 4 <-> 9]
Note: this function does not modify L1 or L2
Note2: the method "add" of the DoublyLinkedList class adds element *at the tail* of the list
:param DL1: a doubly linked list
:param DL2: a doubly linked list
"""
new = DoublyLinkedList()
walk = DL1._head
while walk is not None:
new.add(walk._data)
walk = walk._next
walk = DL2._tail
while walk is not None:
new.add(walk._data)
walk = walk._prev
return new
def test_index_out_of_bounds4(self):
ar = DoublyLinkedList()
for _ in range(1000):
ar.add("x")
self.assertRaises(IndexError, ar.remove_at, -1)
def test_index_out_of_bounds(self):
ar = DoublyLinkedList()
ar.add(None)
ar.add(1)
ar.add("")
self.assertRaises(IndexError, ar.remove_at, 3)
while walk is not None:
new.add(walk._data)
walk = walk._next
walk = DL2._tail
while walk is not None:
new.add(walk._data)
walk = walk._prev
return new
""" main to do some testing"""
if __name__ == '__main__':
""" create two doubly linked lists and add some datastore"""
DL1 = DoublyLinkedList()
DL2 = DoublyLinkedList()
DL1.add("A")
DL1.add("B")
DL1.add("Y")
DL1.add("Z")
DL1.print()
DL2.add(67)
DL2.add(69)
DL2.add(25)
DL2.add(29)
DL2.add(76)
DL2.print()
""" test swap """
print("========== Test swap() ===================================")
swap_first_with_last(DL2)
DL2.print()
print(str(DL2.__len__()))
from doubly_linked_list import DoublyLinkedList
from singly_linked_list import SinglyLinkedList
if __name__ == '__main__':
first = 0
middle = 50000
last = 100000
print 'Running doubly linked list'
doubly_linked_list = DoublyLinkedList()
[doubly_linked_list.add(x) for x in range(last)]
doubly_linked_list.remove(first)
doubly_linked_list.remove(middle)
doubly_linked_list.remove(last - 1)
doubly_linked_list.remove(-1)
print '\nRunning singly linked list'
singly_linked_list = SinglyLinkedList()
[singly_linked_list.add(x) for x in range(last)]
singly_linked_list.remove(first)
singly_linked_list.remove(middle)
singly_linked_list.remove(last - 1)
singly_linked_list.remove(-1)
class DoublyLinkedListTest(unittest.TestCase):
def setUp(self):
self.list=DoublyLinkedList()
def test_add(self):
self.list.add(1)
self.assertEqual(self.list.get_size(),1)
def test_addMultiple(self):
for i in range(4):
self.list.add(i)
self.assertEqual(self.list.get_size(),4)
def test_add_to_index(self):
self.list.add_to_index(5,0)
self.assertEqual(self.list.get(0),5)
self.list.add(1)
self.list.add(3)
self.list.add_to_index(2,1)
self.assertEqual(self.list.get(1),2)
self.list.add_to_index(0,0)
self.assertEqual(self.list.get(0),0)
self.list.add_to_index(4,4)
self.assertEqual(self.list.get(4),4)
def test_get(self):
self.list.add_multiple(1,2,3)
self.assertEqual(self.list.get(1),2)
def test_get_last(self):
self.list.add_multiple(1,2,3)
self.assertEqual(self.list.get_last(),3)
def test_get_first(self):
self.list.add_multiple(1,2,3)
self.assertEqual(self.list.get_first(),1)
def test_remove(self):
self.list.add_multiple(1,2,3,4,5)
self.list.remove(1)
self.assertEqual(self.list.get(1),3)
self.list.remove(0)
self.assertEqual(self.list.get(0),3)
def test_remove_last(self):
self.list.add_multiple(1,2,3,4,5)
self.list.remove_last()
self.assertEqual(self.list.get_last(),4)
def test_pop(self):
self.list.add_multiple(1,2,3)
self.assertEqual(self.list.pop(),3)
self.assertEqual(self.list.pop(),2)
def test_get_size(self):
self.assertEqual(self.list.get_size(),0)
self.list.add_multiple(1,2,3)
self.assertEqual(self.list.get_size(),3)
def test_is_empty(self):
self.assertTrue(self.list.is_empty())
self.list.add_multiple(1,2,3)
self.assertFalse(self.list.is_empty())
def test_str(self):
self.list.add(1)
self.list.add(4)
self.list.add(3)
self.assertEqual(str(self.list),"[1,4,3]")
# var.add(2)
# var.add(3)
# var.add(2)
# var.print_list()
# print("-----")
# var = dedup(var)
# var.print_list()
# print("-----")
# print("-----")
# var = DoublyLinkedList()
# var.add(1)
# var.add(2)
# var.add(2)
# var.add(2)
# var.print_list()
# print("-----")
# var = dedup(var)
# var.print_list()
# print("-----")
# print("-----")
var = DoublyLinkedList()
var.add(1)
var.add(2)
var.add(2)
var.add(2)
var.print_list()
print("-----")
var = dedup_smaller(var)
var.print_list()
