reverse_string_stack.py

"""
String : Python
reversed string : nohtyp


python

[p,y,t,h,o,n]

""+n = n
"n"+o = no

'nohtyp'

"""
class Stack():
    def __init__(self):   
        self.items = []    ## Empty list intilize

    def push(self,item):
        self.items.append(item)  ## simple appending to list

    def pop(self):
        return self.items.pop()  ## Removing top element of the stack

    def is_empty(self):
        return self.items==[]  ### Checking whether the stack is empty or not

    def peek(self):
        if not self.is_empty():
            return self.items[-1]  ## returnign top element using [-1]=last element
 
    def show_stack(self):
        return self.items   ## Printing all the items
 


def reverse_strings(string):
    s = Stack()   ## object for stack class
    for i in range(len(string)):     ## Loop from 0 to len of string
        s.push(string[i])            ## Push each character onto string 
    reverse_string = ""              ## Create a empyt reverse string
    while not s.is_empty():          ## while loop until the stack is empty or not
        reverse_string += s.pop()    ## pop top element and concatenate with the reverse string
    return reverse_string            ## Return reverse string
 

string = str(input("Enter a string : ")) ## Taking string as input
print(reverse_strings(string))     ## Printing reverse string as output