def test_constructor():
s = Stack() # creation of object via constructor
# assert command results in a boolean where you compare your test results
# with an expected output, if assert returns false, the test fails
# assert 1 == 2 # try me
assert isinstance(s, Stack)
# in a test driven development, you will first write the tests, then modify
# the functionality of your code such that it passes the tests
assert len(s) == 0 # to pass this test, Stack needs to implement __len__()
def check_balanced(expr):
opening = '([{'
closing = ')]}'
opening_d = {opening[i] : closing[i] for i in range(len(opening))}
closing_d = {closing[i] : opening[i] for i in range(len(opening))}
s = Stack()
for i, c in enumerate(expr):
if c in opening_d:
s.push(c)
if c in closing_d:
if not s.is_empty() and opening_d[s.peek()] == c:
s.pop()
else:
print('parenthèse fermante en trop au caractère', i+1)
return False
return s.size() == 0
def is_balanced(head: Node) -> bool:
n = head
s = Stack()
balanced = True
while (n != None and balanced):
if n.record == "(":
s.push(n.record)
else:
if (s.isEmpty()):
balanced = False
else:
s.pop()
n = n.next
if balanced and s.isEmpty():
return True
else:
return False
def dec_to_bin(dec: int) -> str:
"""
Converts decimal number to binary
:param dec: decimal input to convert
:return:
"""
s = Stack()
if dec == 0:
s.push(0)
else:
while dec > 0:
rem = dec % 2
s.push(rem)
dec = dec // 2 # floor division
return __construct(s)
def dec_to_n(input: int, base: int): #-> str:
s = Stack()
if (base < 2 or base > 16):
print("Error: Invalid base.")
return
else:
units = __units(base)
while(input > 0):
rem = input % base
transform_rem = rem
if base > 10 :
transform_rem = units[rem]
s.push(transform_rem)
input = input // base
# compose string
acc = []
while (not s.isEmpty()):
acc.append(s.pop())
return ''.join(str(i) for i in acc)
class Queue:
def __init__(self):
self.push_queue = Stack()
self.pop_queue = Stack()
def is_empty(self):
return self.pop_queue.is_empty() and self.push_queue.is_empty()
def enqueue(self, data):
self.push_queue.push(data)
def dequeue(self):
if self.is_empty():
raise Exception('Can\'t dequeue. Queue is empty')
if self.pop_queue.is_empty():
while (not self.push_queue.is_empty()):
self.push_queue.push(self.push_queue.pop())
return self.pop_queue.pop()
def size(self):
return self.push_queue.size() + self.pop_queue.size()
def test_constructor():
s = Stack()
assert isinstance(s, Stack)
assert len(s) == 0
def test_pop():
stack = Stack()
stack.push(1)
assert stack.pop() == 1
class TestStack(unittest.TestCase):
def setUp(self) -> None:
self.list = Stack()
def test_str_stack(self):
self.list.push(1)
self.list.push(2)
self.assertEqual(str(self.list), '[2, 1]')
def test_iter_stack(self):
self.list.push(1)
self.list.push(2)
self.assertEqual([x for x in self.list], [2, 1])
def test_len_stack(self):
self.list.push(1)
self.list.push(2)
self.assertEqual(len(self.list), 2)
_list = Stack([1, 2, 3, 4, 5])
self.assertEqual(len(_list), 5)
def test_stack_with_starting_data(self):
_list = Stack([5, 4, 3])
self.assertEqual([x for x in _list], [3, 4, 5])
_list.push(1)
self.assertEqual([x for x in _list], [1, 3, 4, 5])
def test_is_empty(self):
self.assertTrue(self.list.is_empty)
self.list.push(1)
self.assertFalse(self.list.is_empty)
def test_push_stack(self):
self.list.push(1)
self.assertEqual([x for x in self.list], [1])
self.list.push(2)
self.assertEqual([x for x in self.list], [2, 1])
def test_pop_stack(self):
self.list.push(1)
self.list.push(2)
self.list.push(3)
data = self.list.pop()
self.assertEqual(data, 3)
self.assertEqual([x for x in self.list], [2, 1])
self.list.push(10)
self.list.push(100)
self.list.pop()
data = self.list.pop()
self.assertEqual(data, 10)
self.assertEqual([x for x in self.list], [2, 1])
def test_pop_empty(self):
with self.assertRaises(RuntimeError):
self.list.push(1)
self.list.pop()
self.list.pop()
def test_peek(self):
self.list.push(1)
self.list.push(2)
data = self.list.peek()
self.assertEqual(data, 2)
def test_peek_empty(self):
with self.assertRaises(RuntimeError):
self.list.peek()
def test_len_stack(self):
self.list.push(1)
self.list.push(2)
self.assertEqual(len(self.list), 2)
_list = Stack([1, 2, 3, 4, 5])
self.assertEqual(len(_list), 5)
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.test_stack = Stack()
class StackTest(unittest.TestCase):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.test_stack = Stack()
def test_to_array(self):
self.test_stack.push('4')
self.test_stack.push('5')
self.assertEqual(self.test_stack.to_array(), ['5', '4'])
def test_push(self):
self.test_stack.push(4)
self.test_stack.push(5)
self.assertEqual(self.test_stack.to_array(), [5, 4])
def test_pop(self):
self.test_stack.push(4)
self.test_stack.push(5)
self.assertEqual(self.test_stack.pop(), 5)
self.assertEqual(self.test_stack.to_array(), [4])
def test_length(self):
self.test_stack.push(4)
self.test_stack.push(5)
self.test_stack.push(4)
self.test_stack.pop()
self.assertEqual(len(self.test_stack), 2)
def test_peek(self):
self.test_stack.push(4)
self.test_stack.push(5)
self.test_stack.push(3)
self.assertEqual(self.test_stack.peek(), 3)
def test_is_empty(self):
self.assertEqual(self.test_stack.is_empty(), True)
import sys
import os
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from ds.stack import Stack
if __name__ == "__main__":
string = 'This will be reversed'
stack = Stack()
for s in string:
stack.push(s)
stack.print(sep='', top_marker='')
from ds.stack.Stack import * # myStack = Stack() myStack = Stack([40, 50, 60]) myStack.printStack() myStack.push(10) myStack.push(40) myStack.printStack() print(s) foo(15)
def test_push_over_size():
stack = Stack()
with pytest.raises(AssertionError):
for i in range(0, 11):
stack.push(i)
def __init__(self):
self.push_queue = Stack()
self.pop_queue = Stack()
def test_stack(self):
stack = Stack()
for i in [23, 4, 2, 56]:
stack.push(i)
self.assertEqual(stack.size(), 4)
self.assertEqual(stack.peek(), 56)
self.assertEqual(stack.pop(), 56)
stack.pop()
stack.pop()
stack.pop()
self.assertEqual(stack.size(), 0)
self.assertRaises(RuntimeError, stack.pop)
def test_constructor():
# Create object s from Stack class:
s = Stack()
assert isinstance(s, Stack)
# Call len() will call def __len__(self)
assert len(s) == 0
def stack():
return Stack()
def __construct(s: Stack) -> str:
# compose string
acc = ""
while not s.isEmpty():
acc = acc + str(s.pop())
return acc
def test_stack_with_starting_data(self):
_list = Stack([5, 4, 3])
self.assertEqual([x for x in _list], [3, 4, 5])
_list.push(1)
self.assertEqual([x for x in _list], [1, 3, 4, 5])
def test_constructor():
s = Stack()
assert len(s) == 0
def setUp(self) -> None:
self.list = Stack()
def test_push():
stack = Stack()
for i in range(0, 10):
stack.push(i)
