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Copy pathstack.py
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77 lines (61 loc) · 1.76 KB
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from .cell import Cell
from .exceptions import *
class Stack:
def __init__(self, data=[], max_size=0):
self._top = None
self._size = 0
self._max_size = max_size
for data_item in data:
self.push(data_item)
def empty(self):
return self.size == 0
def full(self):
if self.max_size == 0:
return False
else:
return self.size == self.max_size
def peek(self):
if self.size == 0:
return None
return self._top.value
def push(self, data):
if self.full():
raise Full("Stack is full")
new_cell = Cell(data)
if self.size == 0:
self._top = new_cell
else:
new_cell.bellow = self._top
self._top = new_cell
self._size += 1
def pop(self):
if self.empty():
raise Empty("Stack is empty")
poped_cell = self._top.value
if self.size == 1:
self._top = None
else:
self._top = self._top.bellow
self._size -= 1
return poped_cell
@property
def size(self):
return self._size
@property
def max_size(self):
return self._max_size
def _print_stack(self):
if self.size == 0:
return '<|'
stack_string_print = '<'
current_cell = self._top
while current_cell.bellow is not None:
stack_string_print += '%s, ' % current_cell.value
current_cell = current_cell.bellow
stack_string_print += '%s' % current_cell.value
stack_string_print += '|'
return stack_string_print
def __repr__(self):
return self._print_stack()
def __len__(self):
return self.size