def load_precision(filename):
<EOL>path = _find_file(filename)<EOL>r = dict()<EOL>with open(path, '<STR_LIT:r>') as f:<EOL><INDENT>exec(f.read(), {}, r)<EOL><DEDENT>return r<EOL>
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