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Copy pathbook 3.3.3.py
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35 lines (33 loc) · 797 Bytes
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book 3.3.3.py
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35 lines (33 loc) · 797 Bytes
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class Stack:
def __init__(self):
self.items = []
def isEmpty(self):
return self.items == []
def push(self, item):
self.items.append(item)
def pop(self):
return self.items.pop()
def peek(self):
return self.items[len(self.items)-1]
def size(self):
return len(self.items)
class Stack2():
def __init__(self):
self.items = []
def isEmpty(self):
return self.items == []
def push(self, item):
self.items.insert(0, item)
def pop(self):
return self.items.pop(0)
def peek(self):
return self.items[0]
def size(self):
return len(self.items)
def __repr__(self):
return str(self.items)
s = Stack()
sr = Stack2()
sr.push(666)
print(sr)
print(s.isEmpty())