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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_currencysymbol(self, code):
 """Retrieve the currency symbol from the local file"""

        if not self._symbols:
            symbolpath = os.path.join(self._dir, 'currencies.json')
            with open(symbolpath, encoding='utf8') as df:
                self._symbols = json.load(df)
        return self._symbols.get(code)