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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_currency_symbol(self):
 """Returns the locale currency symbol """

        currency = self.context.bika_setup.getCurrency()
        locale = locales.getLocale("en")
        locale_currency = locale.numbers.currencies.get(currency)
        if locale_currency is None:
            return "$"
        return locale_currency.symbol