class Stack : def __init__ ( self , data ): self . stack = [] if ( data ): self . stack . append ( data ) def push ( self , data ): self . stack . append ( data ) def pop ( self ): popped_elemnt = self . stack . pop () def show ( self ): for i in self . stack : print ( i ) s = Stack ( 45 ) s . push ( 23 ) s . push ( 29 ) s . push ( 695 ) s . show () s . pop () s . show ()