def parse_fuzzy(source, ch):
 saved_pos = source.pos
 if (ch != '{'):
  return None
 constraints = {}
 try:
  parse_fuzzy_item(source, constraints)
  while source.match(','):
   parse_fuzzy_item(source, constraints)
 except ParseError:
  source.pos = saved_pos
  return None
 if (not source.match('}')):
  raise error('expected }', source.string, source.pos)
 return constraints

def parse_fuzzy ( source , ch ) : saved_pos = source . pos if ( ch != '{' ) : return None constraints = { } try : parse_fuzzy_item ( source , constraints ) while source . match ( ',' ) : parse_fuzzy_item ( source , constraints ) except ParseError : source . pos = saved_pos return None if ( not source . match ( '}' ) ) : raise error ( 'expected }' , source . string , source . pos ) return constraints
parses a fuzzy setting .