chatExcel

from collections import UserDict, UserList __all__ = ["LazyDict", "LazyList"] class LazyDict(UserDict): def __init__(self, data): super().__init__() self.data = data def __getitem__(self, k): v = self.data[k] if callable(v): v = v(k) self.data[k] = v return v class LazyList(UserList): def __getitem__(self, k): if isinstance(k, slice): indices = range(*k.indices(len(self))) return [self[i] for i in indices] v = self.data[k] if callable(v): v = v(k) self.data[k] = v return v def __add__(self, other): if isinstance(other, LazyList): other = list(other) elif isinstance(other, list): pass else: return NotImplemented return list(self) + other def __radd__(self, other): if not isinstance(other, list): return NotImplemented return other + list(self)