bibliopixel.util.persistent_dict module

class bibliopixel.util.persistent_dict.PersistentDict(filename)[source]

Bases: dict

A dictionary that persists as a data_file on the filesystem.

PersistentDict is constructed with a filename, which either does not exist, or contains YAML representing a previously stored value.

Each time a PersistentDict is mutated, the file is rewritten with the new stored YAML data.

clear() → None. Remove all items from D.[source]
pop(k[, d]) → v, remove specified key and return the corresponding value.[source]

If key is not found, d is returned if given, otherwise KeyError is raised

popitem() → (k, v), remove and return some (key, value) pair as a[source]

2-tuple; but raise KeyError if D is empty.

update([E, ]**F) → None. Update D from dict/iterable E and F.[source]

If E is present and has a .keys() method, then does: for k in E: D[k] = E[k] If E is present and lacks a .keys() method, then does: for k, v in E: D[k] = v In either case, this is followed by: for k in F: D[k] = F[k]