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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 propget(self, prop, rev, path=None):
 """Get Subversion property value of the path"""

        rev, prefix = self._maprev(rev)
        if path is None:
            return self._propget(prop, str(rev), None)
        else:
            path = type(self).cleanPath(_join(prefix, path))
            return self._propget(prop, str(rev), path)