def update(self, *args, **kwargs):
if len(args) > 1:
raise TypeError("update() takes at most 1 positional "
"arguments ({} given)".format(len(args)))
if len(args) >= 1:
other = args[0]
if isinstance(other, KeyedList):
# Merge
for key, value in other.all_items():
self[key] = value
else:
MutableMapping.update(self, other)
for key, value in kwargs.items():
if isinstance(value, KeyedList):
try:
nestedlist = self[key]
except KeyError:
nestedlist = KeyedList()
self[key] = nestedlist
else:
if not isinstance(nestedlist, KeyedList):
raise KeyError(
'target key "%s" is a value, cannot '
'update value against another keyed list' %
(key, ))
nestedlist.update(value)
else:
self[key] = value
def update(self, *args, **kw):
if args:
lst = args[0]
if len(lst) != len(dict(lst)):
# this does not catch the cases where we overwrite existing
# keys, but those would produce too many warning
msg = (
"Behavior of MultiDict.update() has changed "
"and overwrites duplicate keys. Consider using .extend()"
)
warnings.warn(msg, UserWarning, stacklevel=2)
MutableMapping.update(self, *args, **kw)