Hey internet mates here we are going to make a python program to demonstrate the working of stack in python.
Program code:- #stack implementation """ stack:implemented as a list top:integer having position at topmost element in stack """ def isempty(stk): if stk==[]: return True else: return False def push(stk,item): stk.append(item) top=len(stk)-1 def pop(stk): if isempty(stk): return "Underfow" else: item=stk.pop() if len(stk)==0: top=None else: top=len(stk)-1 return item def peek(stk): if isempty(stk): return "Underflow" else: top=len(stk)-1 return stk[top] def display(stk): if isempty(stk): print("stack empty") else: top=len(stk)-1 print(stk[top],"<<<<top") for a in range(top-1,-1,-1): print(stk[a]) #_main_ stack=[] #initially stack is empty top=None while True: print("STACK OPERATIONS") print("1.PUSH") print("2.POP") print("3.PEEK") print("4.DISPLAY STACK") print("5.EXIT") ch=int(input("Enter your choice(1-5):")) if ch==1: item=int(input("Enter Item:")) push(stack,item) elif ch==2: item=pop(stack) if item=="Underflow": print("Underflow!!Stack is empty.") else: print("Popped item is", item) elif ch==3: item=peek(stack) if item=="Underflow": print("Underflow!! Stack is empty") else: print("Topmost item is:",item) elif ch==4: display(stack) elif ch==5: break else: print("INVALID CHOICE!!")