def is_requirement(line):
<EOL>line = line.strip()<EOL>return not (<EOL>line == '<STR_LIT>' or<EOL>line.startswith('<STR_LIT>') or<EOL>line.startswith('<STR_LIT:#>') or<EOL>line.startswith('<STR_LIT>') or<EOL>line.startswith('<STR_LIT>')<EOL>)<EOL>
Return True if the requirement line is a package requirement;
that is, it is not blank, a comment, or editable.