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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 get_entry(self, pathname_name):
 """Retrieves the specified child file or directory entry. Args: pathname_name: The basename of the child object to retrieve. Returns: The fake file or directory object. Raises: KeyError: if no child exists by the specified name. """

        pathname_name = self._normalized_entryname(pathname_name)
        return self.contents[pathname_name]