[ aramo ]
[ 源代码: frozenlist ]
软件包: python3-frozenlist (1.2.0-1build1)
python3-frozenlist 的相关链接
Trisquel 的资源:
下载源码包 frozenlist:
- [frozenlist_1.2.0-1build1.dsc]
- [frozenlist_1.2.0.orig.tar.gz]
- [frozenlist_1.2.0-1build1.debian.tar.xz]
维护者:
Original Maintainers:
- Debian Python Team
- Piotr Ożarowski
外部的资源:
- 主页 [github.com]
相似软件包:
list-like structure which implements collections.abc.MutableSequence
`frozenlist.FrozenList` is a list-like structure which implements `collections.abc.MutableSequence`. The list is mutable until `FrozenList.freeze` is called, after which list modifications raise `RuntimeError`:
>>> from frozenlist import FrozenList >>> fl = FrozenList([17, 42]) >>> fl.append('spam') >>> fl.append('Vikings') >>> 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.
FrozenList is also hashable, but only when frozen. Otherwise it also throws a RuntimeError:
>>> fl = FrozenList([17, 42, 'spam']) >>> hash(fl) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "frozenlist/_frozenlist.pyx", line 111, in frozenlist._frozenlist.FrozenList.__hash__ raise RuntimeError("Cannot hash unfrozen list.") RuntimeError: Cannot hash unfrozen list. >>> fl.freeze() >>> hash(fl) 3713081631934410656 >>> dictionary = {fl: 'Vikings'} # frozen fl can be a dict key >>> dictionary {<FrozenList(frozen=True, [1, 2])>: 'Vikings'}
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