maya fileInfo wrapper in a dict (use like a dictionary)

FileInfo.py

import maya.cmds as cmds
import collections
import cPickle


class FileInfo(collections.MutableMapping):
    """
    Dictionary style interface for fileInfo
    """
    def _encode(s, txt):
        return cPickle.dumps(txt)

    def _decode(s, u):
        u = u.decode("unicode_escape")
        try:
            return cPickle.loads(str(u))
        except ValueError:
            return u

    def _key(s, k):
        if k in ["application", "product", "version", "cutIdentifier", "osv", "license"]:
            return "%s_" % k
        return k

    def __init__(s):
        s.data = dict()
        init = cmds.fileInfo(q=True)
        if init:
            s.data = dict((k, s._decode(v)) for k, v in (lambda x: zip(x[::2], x[1::2]))(cmds.fileInfo(q=True)))
        s.update(s.data)

    def __getitem__(s, k):
        k = s._key(k)
        s.data[k] = s._decode(cmds.fileInfo(k, q=True)[:1])
        return s.data[k]

    def __setitem__(s, k, v):
        k = s._key(k)
        cmds.fileInfo(k, s._encode(v))
        s.data[k] = v

    def __delitem__(s, k):
        k = s._key(k)
        cmds.fileInfo(rm=k)
        del s.data[k]

    def __iter__(s):
        return iter(s.data)

    def __len__(s):
        return len(s.data)