Package: python3-frozenlist (1.8.0-2) [debports]
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struttura in stile lista che implementa collections.abc.MutableSequence
"frozenlist.FrozenList" è una struttura in stile lista che implementa collections.abc.MutableSequence. La lista è mutabile finché non si chiama "FrozenList.freeze", dopodiché le modifiche alla lista sollevano una eccezione "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.
Si può anche calcolare l'hash di FrozenList, ma solo quando è congelata. Altrimenti viene sollevata un'eccezione "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'} # fl congelata può essere una chiave di dizionario
>>> dictionary
{<FrozenList(frozen=True, [1, 2])>: 'Vikings'}
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Download python3-frozenlist
| Architecture | Package Size | Installed Size | Files |
|---|---|---|---|
| alpha (unofficial port) | 51.6 kB | 329.0 kB | [list of files] |
