def comment(data, what):
data = data.splitlines()<EOL>data = ["<STR_LIT:#>" + x if x.strip().split() == what.split() else x for x in data]<EOL>return "<STR_LIT:\n>".join(data)<EOL>
Comments line containing `what` in string `data`.

Args:
    data (str): Configuration file in string.
    what (str): Line which will be commented out.

Returns:
    str: Configuration file with commented `what`.