def urldecode(query):
 if (query and (not (set(query) <= urlencoded))):
  raise ValueError('Invalid characters in query string.')
 invalid_hex = u'%[^0-9A-Fa-f]|%[0-9A-Fa-f][^0-9A-Fa-f]'
 if len(re.findall(invalid_hex, query)):
  raise ValueError('Invalid hex encoding in query string.')
 query = (query.decode('utf-8') if isinstance(query, str) else query)
 params = urlparse.parse_qsl(query, keep_blank_values=True)
 return decode_params_utf8(params)

def urldecode ( query ) : if ( query and ( not ( set ( query ) <= urlencoded ) ) ) : raise ValueError ( 'Invalid characters in query string.' ) invalid_hex = u'%[^0-9A-Fa-f]|%[0-9A-Fa-f][^0-9A-Fa-f]' if len ( re . findall ( invalid_hex , query ) ) : raise ValueError ( 'Invalid hex encoding in query string.' ) query = ( query . decode ( 'utf-8' ) if isinstance ( query , str ) else query ) params = urlparse . parse_qsl ( query , keep_blank_values = True ) return decode_params_utf8 ( params )
decode a query string in x-www-form-urlencoded format into a sequence of two-element tuples .