code: def load_precision(filename):
      
      # also look in data dir
      path = _find_file(filename)
  
      r = dict()
      with open(path, 'r') as f:
          exec(f.read(), {}, r)
  
      return r
docs: Load a CLASS precision file into a dictionary.
  
      Parameters
      ----------
      filename : str
          the name of an existing file to load, or one in the files included
          as part of the CLASS source
  
      Returns
      -------
      dict :
          the precision parameters loaded from file