[ Source: frozenlist ]
Package: python3-frozenlist (1.5.0-1)
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- Homepage [github.com]
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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 |
---|---|---|---|
ppc64el | 46.3 kB | 185.0 kB | [list of files] |