In [9]:

    

class stack(object):
    '''Class to implement stack data structure with the following methods:
        -push(element)
        -pop()'''
    def __init__(self):
        self.s = []
    def push(self,elem):
        self.s.append(elem)
    def pop(self):
        p =  self.s[-1]
        del self.s[-1]
        return p
def reverseString(string):
    '''Function to reverse string using stack'''
    s = stack()
    for i in xrange(len(string)):
        s.push(string[i])
    f = ''
    for i in xrange(len(string)):
        f+=s.pop()
    return f


    

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