Source code for zict.func

from .common import ZictBase, close


[docs]class Func(ZictBase): """Buffer a MutableMapping with a pair of input/output functions Parameters ---------- dump: callable Function to call on value as we set it into the mapping load: callable Function to call on value as we pull it from the mapping d: MutableMapping Examples -------- >>> def double(x): ... return x * 2 >>> def halve(x): ... return x / 2 >>> d = dict() >>> f = Func(double, halve, d) >>> f['x'] = 10 >>> d {'x': 20} >>> f['x'] 10.0 """ def __init__(self, dump, load, d): self.dump = dump self.load = load self.d = d def __getitem__(self, key): return self.load(self.d[key]) def __setitem__(self, key, value): self.d[key] = self.dump(value) def __contains__(self, key): return key in self.d def __delitem__(self, key): del self.d[key]
[docs] def keys(self): return self.d.keys()
[docs] def values(self): return map(self.load, self.d.values())
[docs] def items(self): return ((k, self.load(v)) for k, v in self.d.items())
def _do_update(self, items): self.d.update((k, self.dump(v)) for k, v in items) def __iter__(self): return iter(self.d) def __len__(self): return len(self.d) def __str__(self): return "<Func: %s<->%s %s>" % ( funcname(self.dump), funcname(self.load), str(self.d), ) __repr__ = __str__ def flush(self): self.d.flush()
[docs] def close(self): close(self.d)
def funcname(func): """Get the name of a function.""" while hasattr(func, "func"): func = func.func try: return func.__name__ except Exception: return str(func)