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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 unstash_it(self, sync=False):
 """ Unstashes changes from current branch for branch sync. Requires prior code setting self.stash_index. """

        if self.stash_index is not None:
            return self.git_exec(
                ['stash', 'pop', 'stash@{{{0}}}'.format(self.stash_index)])