<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def fitted_function(self):
 """ A function of the single independent variable after partially evaluating `scipy_data_fitting.Fit.function` at the `scipy_data_fitting.Fit.fitted_parameters`. """

        function = self.function
        fitted_parameters = self.fitted_parameters
        return lambda x: function(x, *fitted_parameters)