code: def experiments_fmri_download(self, experiment_id):
          
          # Get experiment fMRI to ensure that it exists
          fmri = self.experiments_fmri_get(experiment_id)
          if fmri is None:
              return None
          # Return information about fmRI data file
          return FileInfo(
              fmri.upload_file,
              fmri.properties[datastore.PROPERTY_MIMETYPE],
              fmri.properties[datastore.PROPERTY_FILENAME]
          )
docs: Download the fMRI data file associated with given experiment.
  
          Parameters
          ----------
          experiment_id : string
              Unique experiment identifier
  
          Returns
          -------
          FileInfo
              Information about fMRI file on disk or None if experiment is
              unknown or has no fMRI data associated with it