def _extract_variants(address, variants_str):
 def entries():
  for entry in variants_str.split(u','):
   (key, _, value) = entry.partition(u'=')
   if ((not key) or (not value)):
    raise ValueError(u'Invalid variants after the @ in: {}'.format(address))
   (yield (key, value))
 return tuple(entries())

def _extract_variants ( address , variants_str ) : def entries ( ) : for entry in variants_str . split ( u',' ) : ( key , _ , value ) = entry . partition ( u'=' ) if ( ( not key ) or ( not value ) ) : raise ValueError ( u'Invalid variants after the @ in: {}' . format ( address ) ) ( yield ( key , value ) ) return tuple ( entries ( ) )
return the variants represented by the given variants_str .