Stack with python

Stack with python

Learn basic operations in stack with python. This program will help student to understand basic operations of stack. This is best for beginner to start with.

In this program we have covered following operations.

• Push
• Pop
• Seek
• Length

class  Stack  :
    # Creates  an  empty  stack.
    def	__init__(  self  ):
        self.items  =  list()
        self.size=0
#Author : ITVoyagers Website : itvoyagers.in
    # Returns  True  if  the  stack  is  empty  or  False  otherwise.
    def  isEmpty(  self  ):
        if(self.size==0):
            return True
        else:
            return False
    # Returns  the  number  of  items  in  the  stack.
    def	length (  self  ):
        if self.isEmpty():
            print("Stack is empty")
        else:
            print("number of items present is list are",self.size)
#Author : ITVoyagers Website : itvoyagers.in
    # Returns  the  top  item  on  the  stack  without  removing  it.
    def  peek(  self  ):
        if self.isEmpty():
            print("Stack is empty")
        else:
            print("top most element is", self.items[self.size-1])
#Author : ITVoyagers Website : itvoyagers.in
    # Removes  and  returns  the  top  item  on  the  stack.
    def  pop(  self  ):
        if  self.isEmpty():
            print("Stack is empty")
        else:
            print("the poped elememt is ", self.items.pop())
            self.size-=1
#Author : ITVoyagers Website : itvoyagers.in
    # Push  an  item  onto  the  top  of  the  stack.
    def  push(  self,  item  ):
        self.items.append(item)
        self.size+=1
s=Stack()
print("Menu")
print("1.push n2.pop n3.peek n4.length")
#Author : ITVoyagers Website : itvoyagers.in
ch=int(input("Enter your choice"))
while ch<=4:
    if(ch==1):
        value=int(input("Enter value to be inserted"))
        s.push(value)
    elif (ch==2):
        s.pop()
    elif (ch==3):
        s.peek()
    elif (ch==4):
        s.length()
    ch=int(input("Enter your choice"))

Output :

Menu
1.push 
2.pop 
3.peek 
4.length
Enter your choice1
Enter value to be inserted50
Enter your choice1
Enter value to be inserted60
Enter your choice1
Enter value to be inserted70
Enter your choice2
the poped elememt is  70
Enter your choice3
top most element is 60
Enter your choice4
number of items present is list are 2
Enter your choice

Note : Please note that above program is compatible with Python 3 or higher version.