def test_stack():
"""Fixture for testing."""
from src.stack import Stack
empty = Stack()
one = Stack(5)
multi = Stack([1, 2, 'three', 4, 5])
return empty, one, multi
def initialize_stack(num_disks):
global stacks
global left
global middle
global right
global moves
global inv_f
global min_moves
global final_answer
global game_completion_f
stacks = []
left_stack = Stack("Left")
middle_stack = Stack("Middle")
right_stack = Stack("Right")
stacks.append(left_stack)
stacks.append(middle_stack)
stacks.append(right_stack)
for i in range(num_disks, 0, -1):
stacks[0].push(i)
left = stacks[0].get_items()
middle = stacks[1].get_items()
right = stacks[2].get_items()
moves = 0
inv_f = 0
min_moves = 2**num_disks - 1
game_completion_f = 0
final_answer = left
def test_exceptions(self):
with self.assertRaises(StackUnderflowException):
s = Stack(1)
s.pop()
with self.assertRaises(StackOverflowException):
s = Stack(1)
s.push(10)
s.push(20)
def test_stack_exceptions(self):
with self.assertRaises(ValueError):
s = Stack("A")
with self.assertRaises(ValueError):
s = Stack(10)
s.size = "A"
with self.assertRaises(ValueError):
s = Stack(10)
s.top = "A"
def testStack():
'''
Here we test algorithms for stacks
We test pushing, popping, and checking if
a stack is empty
Stack is implemented as a python list
It's not the best implementation as we'll
show that the stack will be empty yet it
will be occupying memory with the previously
inserted elements
'''
print('Create an empty stack')
s = Stack()
print('Pop now')
print('Topmost element: ' + str(s.pop()))
print('Insert 5')
s.push(5)
print('Insert 3')
s.push(3)
print('Insert 4')
s.push(4)
print('Is stack empty: ' + str(s.isempty()))
print('Position of top: ' + str(s.top))
print('Pop now')
print('Topmost element: ' + str(s.pop()))
print('Pop now')
print('Topmost element: ' + str(s.pop()))
print('Pop now')
print('Topmost element: ' + str(s.pop()))
print('Pop now')
print('Topmost element: ' + str(s.pop()))
print('Stack in the memory')
print(s.storage)
def test_openvpn_security_group():
output = (Stack().template_to_json())
properties = output["Resources"]["OpenVPNSecurityGroup"]["Properties"]
expect(properties["GroupName"]).to.eq('OpenVPN')
expect(properties["GroupDescription"]).to.eq(
'This is a security group for OpenVPN')
expect(properties["SecurityGroupIngress"]).to.eq([{
"CidrIp": "0.0.0.0/0",
"IpProtocol": "tcp",
"FromPort": 22,
"ToPort": 22
}, {
"CidrIp": "0.0.0.0/0",
"IpProtocol": "udp",
"FromPort": 1194,
"ToPort": 1194
}])
expect(properties["SecurityGroupEgress"]).to.eq([{
'CidrIp': '0.0.0.0/0',
'FromPort': -1,
'IpProtocol': -1,
'ToPort': -1
}])
expect(properties["VpcId"]).to.eq(vpc_id)
def test_openvpn_ec2_instance():
output = (Stack().template_to_json())
properties = output["Resources"]["EC2OpenVPN"]["Properties"]
expect(properties["ImageId"]).to.eq('ami-0b69ea66ff7391e80')
expect(properties["InstanceType"]).to.eq('t2.micro')
expect(properties["KeyName"]).to.eq('rwalker')
def test_pop_with_full_stack():
stack = Stack([2, 4, 1, 4020])
expected = 4020
output = stack.pop()
assert output == expected
assert stack.stack[-1] == 1
def test_print_empty_stack(capsys):
stack = Stack()
stack.print()
expected = "[]\n"
output = capsys.readouterr().out
assert output == expected
def expr_to_stack(self, expr):
stack = Stack()
buf = ''
idx = len(expr) - 1
while idx >= 0:
char = expr[idx]
idx -= 1
# If 0-9 then add to buffer (for multi-digit numbers)
if char.isdigit():
buf = char + buf
continue
# Convert value from buffer to integer and move to stack
if buf != '':
stack.push(int(buf))
buf = ''
# Add operators to stack
if not char.isdigit() and char in self.allowed_operators.keys():
stack.push(char)
# Finally flush buffer into stack
if buf != '':
stack.push(int(buf))
return stack
def test_peek_stack_with_elements():
stack = Stack([1, 2, "Dog"])
expected = "Dog"
output = stack.peek()
assert output == expected
assert stack.stack[-1] == expected
def test_print_stack_with_elements(capsys):
stack = Stack([1, 2, 3, 4, 5])
stack.print()
expected = "[1, 2, 3, 4, 5]\n"
output = capsys.readouterr().out
assert output == expected
def test_size(self):
# test if the size is being enforced
stack = Stack(size=10)
for num in range(1000):
stack.push(num)
assert stack.size() == 10
assert stack.stack == [_ for _ in range(10)]
def test():
s = Stack()
assert s.is_empty() is True
s.push(4)
assert s.items == [4]
s.push("dog")
assert s.items == [4, "dog"]
assert s.peek() == "dog"
s.push(True)
assert s.items == [4, "dog", True]
assert s.size() == 3
assert s.is_empty() is False
s.push(8.4)
assert s.items == [4, "dog", True, 8.4]
assert s.pop() == 8.4
assert s.pop() is True
assert s.size() == 2
def test_push(self):
s = Stack(10)
s.push(10)
assert s.top.value == 10
assert s.top.next == None
s.push(20)
assert s.top.value == 20
assert s.top.next.value == 10
def test_push_empty_stack():
stack = Stack()
element = 230
stack.push(element)
expected = [230]
output = stack.stack
assert output == expected
def test_size(self):
s = Stack(10)
s.push(10)
s.push(20)
assert s.size == 2
s.pop()
s.pop()
assert s.size == 0
def test_push():
"""Test push."""
s = Stack()
s.push(3)
s.push(5)
s.push(7)
assert len(s.data) == 3
assert not s.is_empty()
def test_push_with_multiple_elements():
stack = Stack()
stack.push([1, 2, 3])
stack.push("Horse")
stack.push(9.321)
expected = [[1, 2, 3], "Horse", 9.321]
output = stack.stack
assert output == expected
def validate_brackets(sentence):
brackets = Stack()
for char in sentence:
if char == '(':
brackets.push(True)
elif char == ')':
if brackets.pop() is not True:
return False
return brackets.size() == 0
def __init__(self, text: str):
# Data stack (main stack for operations).
self.__ds = Stack()
# Return stack (supports procedures work).
self.__rs = Stack()
# Instruction pointer.
self.__iptr = 0
# Input text parsed into list of values and instructions.
self.__code_list = list(self.parse(text))
# Storage for variables. Mapping names of vars to their values.
self.__heap = dict()
# Storage for procedures.
self.__procedures = dict()
# Mapping operations in our language to functions that perform the necessary business logic.
self.__valid_operations = {
'+': self.sum,
'-': self.sub,
'*': self.mult,
'/': self.div,
'%': self.mod,
'!': self.fact,
'==': self.equal,
'>': self.greater,
'<': self.less,
'and': self.operator_and,
'or': self.operator_or,
'cast_int': self.cast_int,
'cast_str': self.cast_str,
'drop': self.drop,
'over': self.over,
'dup': self.dup,
'if': self.operator_if,
'jmp': self.jump,
'stack': self.output_stack,
'swap': self.swap,
'print': self.print,
'println': self.println,
'read': self.read,
'call': self.call,
'return': self.ret,
'exit': self.exit,
'store': self.store,
'load': self.load,
}
def test_pop(self):
s = Stack()
value = s.pop()
self.assertIsNone(value, 'should return None from empty stack')
s.push(1)
value = s.pop()
self.assertEqual(value, 1, 'should return the stack value')
self.assertEqual(s.pop(), None, 'should remain an empty stack')
def test_pop(self):
s = Stack(10)
s.push(20)
s.push(10)
value = s.pop()
assert value == 10
assert s.top.value == 20
assert s.top.next == None
s.pop()
assert s.top == None
def test_push(self):
s = Stack()
s.push(1)
self.assertEqual(s.top['value'], 1, 'should have inserted 1')
self.assertIsNone(s.top['prev'], 'should have nothing before')
s.push(2)
self.assertEqual(s.top['value'], 2, 'should have 2 as top')
self.assertEqual(s.top['prev']['value'], 1, 'should have 1 before')
self.assertIsNone(s.top['prev']['prev'], '1 is the last value')
def sort_stack(stack):
buffer_stack = Stack()
while(not stack.is_empty()):
value = stack.pop()
if(buffer_stack.is_empty):
buffer_stack.push(value)
else:
if(not buffer_stack.is_empty()):
while(buffer_stack.peek() > value):
temp = buffer_stack.pop()
stack.push(temp)
else:
buffer_stack.push(value)
return buffer_stack
def test_stack_empty(self):
stack = Stack()
self.assertTrue(stack.empty())
stack.push(1)
self.assertFalse(stack.empty())
stack.push(2)
self.assertEqual(stack.__str__(), "Stack[2, 1]")
self.assertFalse(stack.empty())
stack.clear()
self.assertTrue(stack.empty())
def test_len(self):
s = Stack()
self.assertEqual(len(s), 0, 'no elements yet')
s.push(1)
self.assertEqual(len(s), 1, 'one element')
s.push(2)
self.assertEqual(len(s), 2, 'two elements')
s.pop()
self.assertEqual(len(s), 1, 'one element left')
s.pop()
self.assertEqual(len(s), 0, 'no elements left')
s.pop()
self.assertEqual(len(s), 0, 'still no elements left')
def proper_parens(str):
"""Return 0 if string of parens is balanced, 1 if open and -1 if broken."""
stack = Stack()
for i in str:
if i is '(':
stack.push(i)
print('data', stack._container.head.data)
elif i is ')':
try:
stack.pop()
except IndexError:
return -1
if stack._container.head:
return 1
return 0
def main():
template = json.dumps(Stack().template_to_json())
params = {'StackName': stack_name, 'TemplateBody': template}
try:
cf.validate_template(TemplateBody=template)
if _stack_exists(stack_name):
print('Updating {}'.format(stack_name))
cf.update_stack(**params)
waiter = cf.get_waiter('stack_update_complete')
else:
print('Creating {}'.format(stack_name))
cf.create_stack(**params)
waiter = cf.get_waiter('stack_create_complete')
print("...waiting for stack to be ready...")
waiter.wait(StackName=stack_name)
except botocore.exceptions.ClientError as ex:
error_message = ex.response['Error']['Message']
if error_message == 'No updates are to be performed.':
print("No changes")
else:
raise
def test_stack_pop_top(self):
stack = Stack()
self.assertTrue(stack.empty())
stack.push(1)
self.assertFalse(stack.empty())
self.assertEqual(stack.top(), 1)
stack.push(2)
self.assertEqual(stack.top(), 2)
stack.push(3)
self.assertEqual(stack.top(), 3)
self.assertEqual(stack.__str__(), "Stack[3, 2, 1]")
self.assertEqual(stack.pop(), 3)
self.assertEqual(stack.pop(), 2)
self.assertEqual(stack.pop(), 1)
self.assertTrue(stack.empty())
