frozenlist 1.0.0a0

简介

frozenlist.FrozenList是一个类似列表的结构，它实现 collections.abc.MutableSequence。列表是mutable直到FrozenList.freeze 调用，之后列表修改将引发RuntimeError：

>>> from frozenlist import FrozenList
>>> fl = FrozenList([17, 42])
>>> fl
<FrozenList(frozen=False, [17, 42, 'spam', 'Vikings'])>
>>> fl.freeze()
>>> fl
<FrozenList(frozen=True, [17, 42, 'spam', 'Vikings'])>
>>> fl.frozen
True
>>> fl.append("Monty")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "frozenlist/_frozenlist.pyx", line 97, in frozenlist._frozenlist.FrozenList.append
    self._check_frozen()
  File "frozenlist/_frozenlist.pyx", line 19, in frozenlist._frozenlist.FrozenList._check_frozen
    raise RuntimeError("Cannot modify frozen list.")
RuntimeError: Cannot modify frozen list.

安装

$ pip install frozenlist

库需要Python3.5.3或更新版本。