Можно ли в Python создавать бинарные файлы? Конечно можно.
Для этого в Python есть следующие инструменты:
▫️ тип данных bytes и bytearray
▫️ открытие файла в режиме wb (write binary) или rb (read binary)
▫️ модуль struct
Про модуль struct поговорим в первую очередь.
Файл в формате JSON или Yaml внутри себя содержит разметку данных. Всегда можно определить где список начался а где закончился. Где записана строка а где словарь. То есть формат записи данных содержит в себе элементы разметки данных.
В binary-файле данные не имеют визуальной разметки. Это просто байты, записанные один за другим. Правила записи и чтения находятся вне файла.
Модуль struct как раз и помогает с организацией данных в таком файле с помощью определения форматов записи для разных частей файла.
Модуль struct преобразует Python-объекты в массив байт, готовый к записи в файл и имеющий определённый вид.
Для этого всегда следует указывать формат преобразования (или, как оно здесь называется - запаковки).
Формат нужен для того, чтобы выделить достаточное количество байт для записи конкретного типа объекта. В последствии с помощью того же формата будет производиться чтение.
При этом следует помнить что мы говорим о типах языка С а не Python.
Именно формат определяет, что записано в конкретном месте файла, число, строка или что-то еще.
Вот какие токены формата у нас есть.
Помимо этого, первым символом можно указать порядок байтов. На разных системах одни и те же типы данных могут записываться по-разному, поэтому желательно указать конкретный способ из доступных. Если этого не сделать, то используется символ '@', то есть нативный для текущей системы.
В строке формата мы пишем в каком порядке и какие типы собираемся преобразовать в байты.
Запакуем в байты простое число, токен "i".
>>> import struct
>>> struct.pack('=i', 10)
b'\n\x00\x00\x00'
Теперь несколько float, при этом нужно передавать элементы не массивом а последовательностью аргументов.
>>> struct.pack('=fff', 1.0, 2.5, 4.1)
b'\x00\x00\x80?\x00\x00 @33\x83@'
Вместо нескольких токенов можно просто указать нужное количество элементов перед одним токеном, результат будет тот же.
>>> struct.pack('=3f', 1.0, 2.5, 4.1)
b'\x00\x00\x80?\x00\x00 @33\x83@'
Теперь запакуем разные типы
>>> data = struct.pack('=fiQ', 1.0, 4, 100500)
я запаковал типы float, int и unsigned long long (очень большой int, на 8 байт)
b'\x00\x00\x80?\x04\x00\x00...'
Распаковка происходит аналогично, но нужно указать тот же формат, который использовался при запаковке. Результат возвращается всегда в виде кортежа.
>>> struct.unpack('=fiQ', data)
(1.0, 4, 100500)
Как видите, ничего страшного!
#lib#basic
😄Schedule
➖➖➖➖➖➖
🔘Schedule as a noun can be a plan or list of when things happen.
🔜 According to the schedule we start at 9 tomorrow.
🔘A schedule can tell when planes, trains and buses are planned to arrive at and depart from different places.
🔜The flight schedule says that we should be leaving at 1015.
🔘As a verb, schedule means to plan to for something to happen at a certain time. It’s often used in the passive to talk about when things will or should happen.
🔜The meeting was scheduled for 9:30, but everyone was late.
#Schedule👨🏫@America
➖➖➖➖➖➖➖➖➖➖➖➖
🆕 Crypto News @Money
😁 Crypto Game @Egame
🇺🇸 US News @America
🇯🇵 Japan News @Japan
🇦🇪 UAE News @Dubai
▶️ Popular Movies @Videos
😜 Best Funny Video @Funnys
😄Schedule
➖➖➖➖➖➖
🔘Schedule as a noun can be a plan or list of when things happen.
🔜 According to the schedule we start at 9 tomorrow.
🔘A schedule can tell when planes, trains and buses are planned to arrive at and depart from different places.
🔜The flight schedule says that we should be leaving at 1015.
🔘As a verb, schedule means to plan to for something to happen at a certain time. It’s often used in the passive to talk about when things will or should happen.
🔜The meeting was scheduled for 9:30, but everyone was late.
#Schedule👨🏫@America
➖➖➖➖➖➖➖➖➖➖➖➖
🆕 Crypto News @Money
😁 Crypto Game @Egame
🇺🇸 US News @America
🇯🇵 Japan News @Japan
🇦🇪 UAE News @Dubai
▶️ Popular Movies @Videos
😜 Best Funny Video @Funnys
IELTS BAND8.5+ #Schedule
✅A - READING!
Make sure that you spend at least 1 hour a day on the following (don’t forget to record vocab, underline useful collocations, copy them into your vocab book... if you have one):
✅ B - WATCHING
Don't watch your content passively with the video/radio etc. playing in the background. You need to listen attentively since you'll need to do the same in the exam. Train your ear at an early stage and make life easier for yourself down the line. Oh, and if watching something.... subtitles OFF! 1 hour a day, too.
📆 MONDAY
📖National Geographic: select THEMES and randomly read an article whether science, travel, adventure, animals etc.
💻Documentary: think about what you might have read and type the theme into YouTube
📆 TUESDAY
📖Time Magazine: click the box top left next to TIME and randomly read an article whether politics, business, tech, health etc.
💻YouTube Videos: I have put together a number of YouTube channels I enjoy in a post.
📆WEDNESDAY
📖 The Guardian: Randomly select different themes and select an article at random to read
💻BBC World service is a good one. Loads of different themes for background listening: https://www.bbc.co.uk/sounds/play/live:bbc_world_serv..
📆THURSDAY
📖Scientific American : randomly select a news article to read.
💻 Documentary: Curiosity Stream is a good one, but it's a paid website.
📆FRIDAY (Entertainment)
📖 Continue reading a book of your choice PROVIDING it’s not a classic (continue with that after your course)
💻 Watch a film of your choice but still have pen and paper ready! Subtitles off!!!
📆SATURDAYS AND SUNDAYS
Focus on doing your grammar and vocab exercises, practice tests as well as go over the vocab and things you have recorded during the week. Use the weekend to write your essays.
My guidelines:
📌 It doesn't matter if you're interested in the themes or not. In the exam you don't have a choice. So stop being selective. Move beyond Friends and The Big Bang Theory.
📌 Record "chunks of language". Once you've done the article or video, summarize it out aloud recycling that language you have just jotted down. Maybe even write a small summary.
📌 Less is more! Do one article or video a day. That's enough. Better do one, learn and recycle the language rather than watch/read too many and remember nothing.
⚡️@ieltsulugbeks⚡️
IELTS BAND8.5+ #Schedule
✅A - READING!
Make sure that you spend at least 1 hour a day on the following (don’t forget to record vocab, underline useful collocations, copy them into your vocab book... if you have one):
✅ B - WATCHING
Don't watch your content passively with the video/radio etc. playing in the background. You need to listen attentively since you'll need to do the same in the exam. Train your ear at an early stage and make life easier for yourself down the line. Oh, and if watching something.... subtitles OFF! 1 hour a day, too.
📆 MONDAY
📖National Geographic: select THEMES and randomly read an article whether science, travel, adventure, animals etc.
💻Documentary: think about what you might have read and type the theme into YouTube
📆 TUESDAY
📖Time Magazine: click the box top left next to TIME and randomly read an article whether politics, business, tech, health etc.
💻YouTube Videos: I have put together a number of YouTube channels I enjoy in a post.
📆WEDNESDAY
📖 The Guardian: Randomly select different themes and select an article at random to read
💻BBC World service is a good one. Loads of different themes for background listening: https://www.bbc.co.uk/sounds/play/live:bbc_world_serv..
📆THURSDAY
📖Scientific American : randomly select a news article to read.
💻 Documentary: Curiosity Stream is a good one, but it's a paid website.
📆FRIDAY (Entertainment)
📖 Continue reading a book of your choice PROVIDING it’s not a classic (continue with that after your course)
💻 Watch a film of your choice but still have pen and paper ready! Subtitles off!!!
📆SATURDAYS AND SUNDAYS
Focus on doing your grammar and vocab exercises, practice tests as well as go over the vocab and things you have recorded during the week. Use the weekend to write your essays.
My guidelines:
📌 It doesn't matter if you're interested in the themes or not. In the exam you don't have a choice. So stop being selective. Move beyond Friends and The Big Bang Theory.
📌 Record "chunks of language". Once you've done the article or video, summarize it out aloud recycling that language you have just jotted down. Maybe even write a small summary.
📌 Less is more! Do one article or video a day. That's enough. Better do one, learn and recycle the language rather than watch/read too many and remember nothing.
⚡️@ieltsulugbeks⚡️
IELTS BAND8.5+ #Schedule
✅A - READING!
Make sure that you spend at least 1 hour a day on the following (don’t forget to record vocab, underline useful collocations, copy them into your vocab book... if you have one):
✅ B - WATCHING
Don't watch your content passively with the video/radio etc. playing in the background. You need to listen attentively since you'll need to do the same in the exam. Train your ear at an early stage and make life easier for yourself down the line. Oh, and if watching something.... subtitles OFF! 1 hour a day, too.
📆 MONDAY
📖National Geographic: select THEMES and randomly read an article whether science, travel, adventure, animals etc.
💻Documentary: think about what you might have read and type the theme into YouTube
📆 TUESDAY
📖Time Magazine: click the box top left next to TIME and randomly read an article whether politics, business, tech, health etc.
💻YouTube Videos: I have put together a number of YouTube channels I enjoy in a post.
📆WEDNESDAY
📖 The Guardian: Randomly select different themes and select an article at random to read
💻BBC World service is a good one. Loads of different themes for background listening: https://www.bbc.co.uk/sounds/play/live:bbc_world_serv..
📆THURSDAY
📖Scientific American : randomly select a news article to read.
💻 Documentary: Curiosity Stream is a good one, but it's a paid website.
📆FRIDAY (Entertainment)
📖 Continue reading a book of your choice PROVIDING it’s not a classic (continue with that after your course)
💻 Watch a film of your choice but still have pen and paper ready! Subtitles off!!!
📆SATURDAYS AND SUNDAYS
Focus on doing your grammar and vocab exercises, practice tests as well as go over the vocab and things you have recorded during the week. Use the weekend to write your essays.
My guidelines:
📌 It doesn't matter if you're interested in the themes or not. In the exam you don't have a choice. So stop being selective. Move beyond Friends and The Big Bang Theory.
📌 Record "chunks of language". Once you've done the article or video, summarize it out aloud recycling that language you have just jotted down. Maybe even write a small summary.
📌 Less is more! Do one article or video a day. That's enough. Better do one, learn and recycle the language rather than watch/read too many and remember nothing.
⚡️@ieltsulugbeks⚡️
Due to the #coronavirus
the #schedule of #BFIC 's #Koreanclass
is delayed #😢
⠀
Check changed annual schedule
at www.bfic.kr
⠀
✔ 1st Semester: Mar. 2 ~ Jun. 12
✔ Level Test: Feb. 24 ~ Feb. 26
⠀
http://masnun.com/2015/11/20/python-asyncio-future-task-and-the-event-loop.html
On any platform, when we want to do something #asynchronously, it usually involves an #event loop. An event loop is a loop that can register #tasks to be executed, execute them, delay or even cancel them and handle different events related to these operations. Generally, we #schedule multiple async functions to the event loop. The loop runs one function, while that function waits for #IO, it pauses it and runs another. When the first function completes IO, it is resumed. Thus two or more functions can #co_operatively run together. This the main goal of an event loop.
How I Can Study 10h a Day: The Perfect Schedule for Chaotic People
#YouTube#liked#howtostudy#study#howtocreateacalendar#schedulingtips#schedule#howtoschedule#productive
Уважаемые пассажиры,
Рейс Улан Батор - Улан Удэ - Улан Батор будет выполняться согласно расписанию, по вторникам и субботам. Желающие приобрести билеты на апрель могут обратиться по эл.адресу [email protected]. Также билеты из Улан Удэ в Улан Батор можно купить в кассе аэропорта Байкал.
Дни рейсов: 02, 05, 09, 12, 16, 19, 23, 26, 30-ое апреля.
Номер телефона нашего представителя в Улан Удэ:
+7 950 388 22 20
#Hunnu_Air#Ulan_Ude#Ulaanbaatar#Tuesday#Saturday#Schedule#Flight#April_2022
FTX Announces Preliminary Fund Distribution Schedule
🔵 FTX reveals a preliminary payment distribution schedule for creditors.
🔵 Claims under $50k total $1.2 billion.
🔴 By January 20: Preliminary claims must be met.
🔴February 25 - March 4: Expected period for fund distribution begins.
🤔 Will this bring additional liquidity to the market?
Read more
#FTX#Crypto#Market#Liquidity#Payments#Claims#Finance#Investments#Bitcoin#News#Updates#Distribution#Schedule#CryptoTwitter#Investors#Creditors#Funds#Return#January#February#March