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Stack.py
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Stack.py
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# ----------------------------------------------------------- #
# ____ _____ _ #
# / __ \ | __ \ (_) #
# | | | |_ __ ___ _ __ | |__) |___ ___ _ __ _ ___ #
# | | | | '_ \ / _ \ '_ \ | _ // _ \ / _ \| '_ \| |/ _ \ #
# | |__| | |_) | __/ | | | | | \ \ (_) | (_) | | | | | __/ #
# \____/| .__/ \___|_| |_| |_| \_\___/ \___/|_| |_|_|\___| #
# | | #
# |_| #
# #
# Antonio Carlos Vargas Torres A00813182 #
# Rubén Eugenio Cantu Vota A00814298 #
# ----------------------------------------------------------- #
class Stack:
def __init__(self):
self.items = []
def isEmpty(self):
return self.items == []
def push(self, item):
return self.items.append(item)
def pop(self):
if self.size() > 0 :
return self.items.pop()
else :
return None
def peek(self):
if self.isEmpty():
return None
else:
return self.items[self.size()-1]
def size(self):
return len(self.items)