Fix Ferreterias Facturacion -
"Sorting it?" Marco laughed, a sharp, humorless sound. "My accountant is having a seizure. I have expenses to declare. If I don't get a valid factura with the real tax ID and the correct breakdown by Friday, I can't pay you for the drill set I bought last week."
"We inventory first," Silvia said, not looking up. "You can't fix the billing if you don't know what you're billing. Right now, do you know if you have six or sixty boxes of half-inch screws?" fix ferreterias facturacion
To ensure a smooth transition to the new billing system, we propose the following implementation roadmap: "Sorting it
This was the problem. The "system" Elias referred to was actually a stack of spiral notebooks and a vintage cash register that went "ka-ching" but did little else. His nephew, Rolo, was supposed to be digitizing the receipts, but Rolo spent more time playing mobile games than entering SKU numbers. If I don't get a valid factura with
Вопрос:
Что выведет функция hash() для следующих значений: 1, 0, -1, -2?
"Sorting it?" Marco laughed, a sharp, humorless sound. "My accountant is having a seizure. I have expenses to declare. If I don't get a valid factura with the real tax ID and the correct breakdown by Friday, I can't pay you for the drill set I bought last week."
"We inventory first," Silvia said, not looking up. "You can't fix the billing if you don't know what you're billing. Right now, do you know if you have six or sixty boxes of half-inch screws?"
To ensure a smooth transition to the new billing system, we propose the following implementation roadmap:
This was the problem. The "system" Elias referred to was actually a stack of spiral notebooks and a vintage cash register that went "ka-ching" but did little else. His nephew, Rolo, was supposed to be digitizing the receipts, but Rolo spent more time playing mobile games than entering SKU numbers.
hash() может показаться незначительной, важно помнить о ней при работе с хэш-функциями и структурами данных, основанных на хэшировании. В большинстве случаев вы не столкнетесь с проблемами, но знание этой детали поможет вам избежать потенциальных ошибок и лучше понимать внутреннее устройство Python.Ключевые выводы:
Для небольших целых чисел в Python используется оптимизация (интернирование).
hash(x) == x для большинства целых чисел, но hash(-1) == -2 из-за внутренней реализации и для предотвращения коллизий.
Это поведение является специфичным для CPython и может отличаться в других реализациях Python (например, PyPy).
Используйте == для сравнения значений и is для сравнения идентичности объектов.
Надеюсь, теперь эта загадка с hash(-1) стала немного понятнее!
hash(-1) всегда возвращает -2, поэтому hash(-1) == hash(-2).__hash__() в пользовательских классах.
