code: def get_language_progress(self, lang):
          
          if not self._is_current_language(lang):
              self._switch_language(lang)
  
          fields = ['streak', 'language_string', 'level_progress',
                    'num_skills_learned', 'level_percent', 'level_points',
                    'points_rank', 'next_level', 'level_left', 'language',
                    'points', 'fluency_score', 'level']
  
          return self._make_dict(fields, self.user_data.language_data[lang])
docs: Get informations about user's progression in a language.