xonsh.lib.collections¶
Base class for chaining DBs
- class xonsh.lib.collections.ChainDB(*maps)[source]¶
A ChainMap who’s
_getitem__returns either a ChainDB or the result. The results resolve to the outermost mapping.Initialize a ChainMap by setting maps to the given mappings. If no mappings are provided, a single empty dictionary is used.
- clear()¶
Clear maps[0], leaving maps[1:] intact.
- copy()¶
New ChainMap or subclass with a new copy of maps[0] and refs to maps[1:]
- classmethod fromkeys(iterable, *args)¶
Create a ChainMap with a single dict created from the iterable.
- get(k[, d]) D[k] if k in D, else d. d defaults to None.¶
- items() a set-like object providing a view on D's items¶
- keys() a set-like object providing a view on D's keys¶
- new_child(m=None, **kwargs)¶
New ChainMap with a new map followed by all previous maps. If no map is provided, an empty dict is used. Keyword arguments update the map or new empty dict.
- pop(key, *args)¶
Remove key from maps[0] and return its value. Raise KeyError if key not in maps[0].
- popitem()¶
Remove and return an item pair from maps[0]. Raise KeyError is maps[0] is empty.
- setdefault(k[, d]) D.get(k,d), also set D[k]=d if k not in D¶
- update([E, ]**F) None. Update D from mapping/iterable E and F.¶
If E present and has a .keys() method, does: for k in E: D[k] = E[k] If E present and lacks .keys() method, does: for (k, v) in E: D[k] = v In either case, this is followed by: for k, v in F.items(): D[k] = v
- values() an object providing a view on D's values¶
- property parents¶
New ChainMap from maps[1:].