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Изворен канал @pythonotes · Post #156 · 2 окт.

Те, кто в Python не первый день, хорошо знают, что на число можно умножить не только число, но и другие типы. Главное, чтобы у этих типов была реализация такой операции. # list >>> [1] * 3 [1, 1, 1] # tuple >>> (2, 3) * 3 (2, 3, 2, 3, 2, 3) # string >>> "A" * 3 "AAA" Так работает полиморфизм стандартных типов. Интересно здесь то, что это сработает и в том случае, когда порядок операндов обратный. То есть int умножить на [тип]. # list >>> 3 * [1] [1, 1, 1] # tuple >>> 3 * (2, 3) (2, 3, 2, 3, 2, 3) # string >>> 3 * "A" "AAA" Если хотите реализовать такое поведение в ваших классах то следует помнить два момента: 1. Если множитель справа, то вам нужно реализовать метод __mul__, наш класс это первый операнд, то есть слева. myType * 3 2. Если множитель слева, то вам нужно реализовать метод __rmul__, наш класс это второй операнд, справа. 3* myType Всё тоже самое можно делать и для других математических операторов. И если в этом примере действие и результат будут фактически одинаковыми, то бывают ситуации, когда это не так. Например, при умножении матриц имеет значение порядок операндов. Для других операторов, таких как деление или сдвиг, очень важно кто с какой стороны находится. >>> 2/4, 4/2 (0.5, 2.0) >>> 2<<3, 3<<2 (16, 12) >>> 100%15, 15%100 (10, 15) #tricks#basic

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Car News

@car_news · Post #630 · 12.10.2024 г., 12:31

🚘 Cybercab announced: Elon Musk’s robotaxi is finally here 📍 Tesla boss Elon Musk has unveiled the firm's long-awaited robotaxi, the Cybercab, at the Warner Bros Studios in Burbank, California. 🚕 The robotaxi is a purpose-built autonomous vehicle, lacking a steering wheel or pedals, meaning it will need approval from regulators before going into production. The design was futuristic, with doors that open upward like butterfly wings and a small cabin with only enough space for two passengers. There was no steering wheel or pedals, nor was there a plug — Musk said the vehicle charges inductively to regain power wirelessly. 🚐 In a surprise, the company also revealed a "robovan," a self-driving van capable of carrying up to 20 passengers or being configured for cargo purposes. 🪙 Musk said that autonomous cars are expected to be 10–20 times safer than human-driven vehicles and could cost as little as 20 cents per mile, compared to the $1 per mile for city buses. @CarsNews #Tesla#driverless

Car News

@car_news · Post #105 · 07.06.2024 г., 09:09

New 🚘 electric cars will get Chinese autopilot It will be developed by startup Momenta and will debut on the CLA electric sedan. The hardware will be based on Nvidia's Orin X chip. The all-electric CLA will be equipped with a high-level intelligent driving system that does not rely on high-definition maps. This advanced system will provide navigation in the city, and mass production of the electric car is scheduled for April 2025. Mercedes-Benz is one of Momenta's investors, along with GM and SAIC. @CarsNews #Mercedes#EV#driverless

Car News

@car_news · Post #1763 · 26.12.2025 г., 10:45

🚕Waymo robotaxis are back at the center of a scandal 📍 This time, the vehicles caused chaos on the streets of San Francisco. 🚥 The autonomous taxis use the traffic-light system for navigation, so when it goes down, route planning breaks as well. ⛔ For several hours, Waymo cars stood on the roads like bricks, blocking other drivers from getting through. Is rise of the the machines beginning? #driverless#incidents@Car_News

Car News

@car_news · Post #1741 · 12.12.2025 г., 13:33

😰Three Waymo robotaxis caused a “standoff” and blocked a street in San Francisco 📰 In the northern part of San Francisco, three Waymo autonomous taxis got stuck on a narrow street, completely blocking traffic. Two cars lightly collided while trying to maneuver, after which both went into emergency mode, and the third stopped right in front of them, creating a full traffic jam. 😤 Because of this, residents couldn’t leave their driveways and had to wait for company engineers to intervene and resolve the situation. All vehicles were empty — no passengers were inside. 💬 Waymo commented on the incident, calling it a “learning moment” for improving their autonomous driving system. #driverless#incidents@Car_News