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21_stack.py

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 basic-tutorials

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21_stack.py

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# Stack -> Last In First Out (LIFO)

l=[]

while True:

c=int(input('''

1. Push

2. Pop Last Element

3. Peek Last Element

4. Display

5. Exit

PLease choose an option

'''))

if c==1:

n = input("Enter the value : ")

l.append(n)

print(l)

elif c==2:

if len(l)==0:

print("Empty Stack")

else:

p=l.pop()

print(p)

print(l)

elif c==3:

if len(l) == 0:

print("Empty Stack")

else:

print(l[-1])

elif c == 4:

if len(l) == 0:

print("Empty Stack")

else:

print(l)

elif c == 5:

break

else:

print("Invalid")