def invert(d, flat=False):
new_dict = clone(d, empty=True)
for key, value in d.items():
if type_util.is_list_or_tuple(value):
_invert_list(new_dict, key, value, flat)
else:
_invert_item(new_dict, key, value, flat)
return new_dict
def unflatten(d, separator='_'):
new_dict = clone(d, empty=True)
keys = list(d.keys())
for key in keys:
value = d.get(key, None)
new_keys, new_value = _unflatten_item(key, value, separator)
keylist_util.set_item(new_dict, new_keys, new_value)
return new_dict
def filter(d, predicate):
if not callable(predicate):
raise ValueError('predicate argument must be a callable.')
new_dict = clone(d, empty=True)
keys = list(d.keys())
for key in keys:
value = d.get(key, None)
if predicate(key, value):
new_dict[key] = value
return new_dict
def flatten(d, separator='_'):
new_dict = clone(d, empty=True)
return _flatten_item(d,
base_dict=new_dict,
base_key='',
separator=separator)