def indent(s, spaces=<NUM_LIT:4>):
new = re.sub('<STR_LIT>', '<STR_LIT>' % ('<STR_LIT:U+0020>' * spaces), s)<EOL>return ('<STR_LIT:U+0020>' * spaces) + new.strip()<EOL>
Inserts `spaces` after each string of new lines in `s`
and before the start of the string.