Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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# cannot contain syntax error

# stack class
class Stack:
def __init__(self, iL=[]):
self.aList = iL[:]

def push(self, newElem:int):
"""push a new element on top"""
self.aList.append(newElem)

def pop(self)->int:
"""return top item"""
return self.aList.pop()

def empty(self):
"""Is the stack empty?"""
return self.aList == []

def __repr__(self):
return repr(self.aList)

# use only the above stack methods to define a function to
# delete an item x from a stack, (only one x (the upper one) is to be deleted)
# keep the order of the remaining items in the stack unchanged
# can change orginal stack
# return a new stack

def delx(sk:Stack, x:'item')-> Stack:

#Code goes here

if __name__ == "__main__":

#Testing code here

 

 

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