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Изворен канал @pythonotes · Post #83 · 11 мај

У строки в Python есть два очень похожих метода. На столько похожих что кажется они делают одно и тоже. Это метод isdigit() и isnumeric() Давайте посмотрим зачем нам два одинаковых метода? И так ли они одинаковы? Очевидно что isdigit() говорит нам, состоит ли строка только из чисел 0-9 >>> '12'.isdigit() True >>> '12x'.isdigit() False >>> '-12'.isdigit() False >>> '12.5'.isdigit() False Можно предположить что isnumeric() делает более глубокий анализ и распознаёт в строке float или отрицательное число. >>> '15'.isnumeric() True >>> '-15'.isnumeric() False >>> '15.2'.isnumeric() False Нет, всё так же как и с другим методом. В чем же тогда разница? Для начала посмотрим следующие примеры: >>> '5'.isdigit(), '5'.isnumeric() # Обычная цифра 5 # True, True >>> '꧕'.isdigit(), '꧕'.isnumeric() # Яванская 5 # True, True >>> '෩'.isdigit(), '෩'.isnumeric() # Синхала 3 # True, True >>> '৩'.isdigit(), '৩'.isnumeric() # Бенгальская 3 # True, True >>> '༣'.isdigit(), '༣'.isnumeric() # Тибетская 3 # True, True >>> '³'.isdigit(), '³'.isnumeric() # 3 верхний индекс (степень) # True, True >>> '𝟝'.isdigit(), '𝟝'.isnumeric() # Математическая двойная 5 # True, True >>> '๔'.isdigit(), '๔'.isnumeric() # Тайская 4 # True, True >>> '➑'.isdigit(), '➑'.isnumeric() # 8 в круге # True, True А теперь примеры в которых, по мнению Python, результаты не равны >>> '¾'.isdigit(), '¾'.isnumeric() # дробь три четверти # False, True >>> '⅕'.isdigit(), '⅕'.isnumeric() # дробь одна пятая # False, True >>> '𒐶'.isdigit(), '𒐶'.isnumeric() # клинопись 3 # False, True >>> '三'.isdigit(), '三'.isnumeric() # 3 из унифицированной идеограммы # False, True >>> '⑩'.isdigit(), '⑩'.isnumeric() # цифра 10 в круге # False, True >>> 'Ⅳ'.isdigit(), 'Ⅳ'.isnumeric() # Римская 4 # False, True >>> '𑇪'.isdigit(), '𑇪'.isnumeric() # Сенегальская архаическая 10 # False, True >>> '𐌢'.isdigit(), '𐌢'.isnumeric() # Этрусская цифра 10 # False, True >>> 'ↂ'.isdigit(), 'ↂ'.isnumeric() # Римская цифра 10000 # False, True >>> '〇'.isdigit(), '〇'.isnumeric() # Символ ККЯ ноль # False, True Получается, что isdigit() говорит нам, является ли символ десятичной цифрой или спецсимволом, имеющим цифирное значение после преобразования. В свою очередь isnumeric() включает все дополнительные символы юникода которые имеют отношения к числовым и цифровым представлениям. Ну и пара примеров в которых в обоих случаях символ не является числом, это эмодзи. >>> '🕙'.isdigit(), '🕙'.isnumeric() # эмодзи 10 часов # False, False >>> '7️⃣'.isdigit(), '7️⃣'.isnumeric() # эмодзи 7 # False, False Также есть еще один дополнительный и весьма полезный метод isdecimal(). Он нам сообщает, можно ли из указанного символа сделать простую десятичную цифру. То есть сработает ли метод int(x) >>> '෩'.isdecimal(), int('෩') # Синхала 3 # True, 3 >>> '➑'.isdecimal(), int('➑') # 8 в круге # False, ValueError Какие выводы? 🔸 При определении цифры в строке isdigit() подходит лучше чем isnumeric(), но оба не гарантируют успешную конвертацию в int 🔸 Для однозначного определения возможности преобразования строки в int лучше подходит метод isdecimal() 🔸 Для однозначного определения символов 0...9 лучше использовать regex Полный список символов юникода которые определяются как numeric #basic

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The Open Platform

@topco · Post #27 · 04.01.2023 г., 09:04

DeFi: December headlines - Solana DeFi is down 98% from $10.17 Billion: the sharp decline has been majorly linked with the FTX demise as SBF, FTX’s former CEO, now termed the biggest fraudster in history, strongly backed Solana’s native token, SOL (source) - Uniswap overtakes Solana and becomes 16th top crypto: market data shows that Uniswap’s market cap stands at $3.875 billion. It is 5.36% higher than solana’s current market cap of $3.678 billion (source) - Solana DeFi exchange Raydium hacked for over $2 million (source) - 6 quadrillion tokens were hacked on DeFi protocol Ankr, which is speculated to be an inside job (source) - SushiSwap proposes 'immediate' action to support its treasury: SushiSwap is facing a significant deficit in its treasury that threatens its long-term operational viability, to address this, lead developer Jared Gray proposed setting Kanpai, a fee-diversion protocol, to 100% of fees diverted to the Treasury multisig for one year, or until new token distribution and reward schemes are implemented (source) - T3rn raises $6.5 million for bridge-free multi-chain interoperability - t3rn is currently working on developing an expressive protocol for making generalizable function calls across multiple chains that will allow for the composition of multi-step transactions across several chains with a single call, which is not possible with bridges (source) - DeFi protocol perennial launches, announces $12M in funding - Perennial is a decentralized-finance (DeFi) platform used to trade derivatives (source) #DeFi#December2022#trends

The Open Platform

@topco · Post #33 · 11.01.2023 г., 09:04

Metaverse: December headlines - BlackRock unveils metaverse and global SRI ETFs - Qontigo selects the top 10% of companies with High Quality Patents (HQP) in technologies ranging from 3D image modelling, avatars, blockchain, graphic processing units (GPU), non-fungible tokens (NFT) and virtual, augmented and extended reality, based on EconSight data (source) - Metaverse-first blockchain Lamina1 launches rolling fund for Web3 builders to provide them with a capital-raising tool for their open metaverse ventures and to offer investors a chance to get in on projects at the ground level (source) - South Korea’s wild plan to dominate the metaverse - the South Korean government has an ambitious $44.6 billion plan called the “Digital New Deal”, including $171.6 million earmarked to help South Korea become ranked No. 5 among the most metaverse-adopted countries in the world by 2026 — up from its current place at No. 12 (source) - Alibaba's E-Commerce Platform Braces For Its Metaverse Debut - Taobao conducted final tests before making its first metaverse live-streaming product, which will likely launch online around the upcoming New Year's shopping extravaganza (source) - Metaverse experience to sway real-world travel choices in 2023 - a survey participated by 24,179 respondents across 32 countries reveal that nearly half, or 43% of the respondents, intend to use virtual reality to inspire their choices (source) - Warner Music Group Furthers Metaverse Push With Digital Fashion Startup DressX - Warner and DressX want everyone to have a “meta-closet” full of digital wearables (source) #metaverse#December2022#trends

The Open Platform

@topco · Post #31 · 09.01.2023 г., 09:04

Crypto Payments: December headlines - Stripe debuts fiat-to-crypto payment offering for Web3 businesses - the widget allows customers to more easily use crypto to engage with businesses and content creators across the world (source) - Crypto.com receives license as a payment institution in Brazil, the company is the first crypto exchange to become a licensed payments institution in the South American country (source) - Visa released a technical paper in which it explored the possibility of developing an automatic payment system for self-custodial wallets on Ethereum (source) - South African digital-only bank launches crypto payments gateway - Be Mobile Africa has reportedly launched a crypto payment gateway that allows merchants to convert digital currency payments to fiat currency to "help small businesses preserve wealth in unfavourable economic conditions” (source) - Crypto Refills Labs releases a report on consumer adoption on crypto payments - according to report, cryptoshoppers are less worried about transaction fees, more interested in stablecoins and spend crypto more frequently (source) #paymentsolutions#December2022#trends

The Open Platform

@topco · Post #32 · 10.01.2023 г., 09:04

Web3 Creator Economy: December headlines - Impact Venture Capital invests in $8 million seed round for Web3 startup Virtualness - Virtualness is a mobile-first platform designed to help creators and brands navigate the complex world of Web3 (source) - Animoca Brands and its subsidiary TinyTap, the platform for user-generated educational games, announced that the second series of teacher-authored Publisher NFTs will be auctioned on OpenSea starting at 19:00 (EST) on 15 December, the firm’s recently introduced Publisher NFTs leverage Web3 technologies and community to improve earning opportunities for educators, create new earning and promotional options for co-publishers, and empower the community to directly support the growth of learning (source) - Web3 Game project Magic Fantasy has completed $3 M private round investment - Magic Fantasy is a strategic card game, which enables players to co-share the rewards of the game through winning in PvP season and will release the creation power of equipment, gameplay, etc, so as to motivate the players become creators (source) - Revel raises $7.8M to become the Instagram and Robinhood of NFT platforms - Revel is a cross between a social network and a marketplace meant to be a simple trading platform that’s gamified, allowing individuals to mint photos and videos as collectibles (source) #creatoreconomy#December2022#trends

The Open Platform

@topco · Post #30 · 06.01.2023 г., 09:04

Wallets: December headlines: - Crypto wallet BitKeep loses $8 million in ongoing hack - Bitkeep points to malicious APK packages (source) - Anonymous crypto wallet moves $80 million worth of Bitcoin onto Coinbase - cryptocurrency transfers from wallets to exchanges is typically a bearish signal (source) - Senator Warren introduces new crypto bill targeting self-custody wallets, the bill would expand KYC requirements for crypto network participants, is descibed by critics as “opportunistic” and “unconstitutional” (source) - Huobi releases a report on crypto wallet usage, highlights that crypto wallets users grew to 85 million in 2022 (6% increase) (source) - SafePal integrates support for TON - SafePal users will now be able to store and send the native $TON token within their hardware and software wallets. Additionally, it will be possible to directly interact with the Decentralized Applications (DApps) that currently exist on the TON blockchain (source) #wallets#December2022#trends