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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def set_current(self, value):
        '''
        Set the self.current string.
        '''
        self.current = value
        self.cursor = 0
        self.limit = len(self.current)
        self.limit_backward = 0
        self.bra = self.cursor
        self.ket = self.limit