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#mutable string class in python

class Mstring:
    
    def __init__(self, string=None):
        if string:
            self.string = list(string)
        else:
            self.string = []
    def __repr__(self):
        return str(self.string)
    def __setitem__(self, key, value):
        assert value.__class__ is str
        self.string[key] = value
    def tostring(self):
        return ''.join(self.string)