code: def symbol_for_ticker(self, ticker, field, provider, providers):
          '''Return an instance of *symboldata* containing
  information about the data provider, the data provider ticker name
  and the data provider field.'''
          provider = provider or settings.default_provider
          if provider:
              provider = providers.get(provider, None)
          return self.symboldata(ticker, field, providerf symbol_for_ticker(self, ticker, field, provider, providers):
          '''Return an instance of *symboldata* containing
  information about the data provider, the data provider ticker name
  and the data provider field.'''
          provider = provider or settings.default_provider
          if provider:
              provider = providers.get(provider, None)
          return self.symboldata(ticker, field, provider)
docs: Return an instance of *symboldata* containing
  information about the data provider, the data provider ticker name
  and the data provider field.