Limitations

Not implemented methods because of technical reasons

Some methods in dict are not implemented because of technical reasons. These methods will not implement in the future.

del d[key]

There not method to implement this feature with C.

copy()

fromkeys(seq[, value])

Since yakc stores data values of data, we cannot implement shallow copy.

Not implemented, but will implement methods

setdefault(key[, default])

Value store vs. Reference store

Since yakc stores a value of a data, not a reference of a data, some codes not works like Python dict. For example, the function shown in below results different between Python dict and yakc.

>>> import yakc
>>> def diffresult(d):
...     l = list()
...     d[1] = l
...     l.append(1)
...     return d[1]
...
>>> print diffresult(dict())
[1]
>>> print diffresult(yakc.KyotoDB('test.kch'))
[]