@sirJimmy · Post #28902 · 02.05.2022 г., 16:04
A moment of patience in a moment of anger, prevents thousands of moments of regret. #truewisdom #selfmotivation #sirjimmy #teamjimmy
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Изворен канал @pythonotes · Post #241 · 5 мај
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
Пребарај: #truewisdom
@sirJimmy · Post #28902 · 02.05.2022 г., 16:04
A moment of patience in a moment of anger, prevents thousands of moments of regret. #truewisdom #selfmotivation #sirjimmy #teamjimmy
@englishmeta1 · Post #250 · 26.06.2024 г., 10:40
Question ppl ask me often How can I improve my writing skills? Here is my reply Improving your writing skills is a valuable endeavor that can benefit you in many areas of life. Here are several strategies you can use to become a better writer: 1. Read Regularly: - Diverse Materials: Read a variety of genres, including fiction, non-fiction, journalism, and academic papers. This exposes you to different styles and vocabularies. - Analyzing: Pay attention to how authors construct sentences, develop ideas, and build arguments. Reflect on what makes their writing effective or ineffective. 2. Write Daily: - Journaling: Keep a daily journal to practice writing regularly. It doesn’t have to be formal; the goal is to make writing a habit. - Prompts: Use writing prompts to challenge yourself and spark creativity. Websites and books often offer daily prompts. 3. Learn the Basics: - Grammar and Syntax: Brush up on grammar and syntax rules. Resources like "The Elements of Style" by Strunk and White can be very useful. - Vocabulary: Expand your vocabulary through reading and using tools like a thesaurus. 4. Seek Feedback: - Peer Review: Share your writing with friends, colleagues, or writing groups to get constructive feedback. - Professional Feedback: Consider hiring a writing coach or taking a writing course. 5. Revise and Edit: - Multiple Drafts: Don’t be afraid to write multiple drafts. Revision is a crucial part of the writing process. - Editing: Learn to edit your work critically. Look for clarity, coherence, conciseness, and correctness. 6. Study Writing Techniques: - Workshops and Courses: Enroll in writing workshops or online courses. Websites like Coursera, Udemy, and edX offer courses on various aspects of writing. - Books on Writing: Read books about writing, such as "On Writing" by Stephen King or "Bird by Bird" by Anne Lamott. 7. Practice Different Styles: - Genres: Experiment with different genres (e.g., poetry, essays, short stories, technical writing) to find your strengths and preferences. - Perspectives: Write from different perspectives and in various voices to develop versatility. 8. Use Writing Tools: - Software: Use tools like Grammarly, Hemingway Editor, or ProWritingAid to help with grammar and style. - Outlining: Use outlining tools to organize your thoughts before you start writing. 9. Stay Motivated: - Set Goals: Set specific, achievable writing goals (e.g., write 500 words a day, complete a short story in a month). - Celebrate Progress: Acknowledge and celebrate your progress to stay motivated. 10. Read Aloud: - Hearing Your Writing: Reading your work aloud can help you catch errors and awkward phrasing that you might miss when reading silently. Improving your writing skills is a continuous process, and persistence is key. By integrating these strategies into your routine, you'll gradually become a more confident and effective writer. #sirjimmy#teamjimmy#writingskills#englishmadeeasy#truewisdom
@sirjimmy · Post #31107 · 26.06.2024 г., 08:19
Question ppl ask me often How can I improve my writing skills? Here is my reply Improving your writing skills is a valuable endeavor that can benefit you in many areas of life. Here are several strategies you can use to become a better writer: 1. Read Regularly: - Diverse Materials: Read a variety of genres, including fiction, non-fiction, journalism, and academic papers. This exposes you to different styles and vocabularies. - Analyzing: Pay attention to how authors construct sentences, develop ideas, and build arguments. Reflect on what makes their writing effective or ineffective. 2. Write Daily: - Journaling: Keep a daily journal to practice writing regularly. It doesn’t have to be formal; the goal is to make writing a habit. - Prompts: Use writing prompts to challenge yourself and spark creativity. Websites and books often offer daily prompts. 3. Learn the Basics: - Grammar and Syntax: Brush up on grammar and syntax rules. Resources like "The Elements of Style" by Strunk and White can be very useful. - Vocabulary: Expand your vocabulary through reading and using tools like a thesaurus. 4. Seek Feedback: - Peer Review: Share your writing with friends, colleagues, or writing groups to get constructive feedback. - Professional Feedback: Consider hiring a writing coach or taking a writing course. 5. Revise and Edit: - Multiple Drafts: Don’t be afraid to write multiple drafts. Revision is a crucial part of the writing process. - Editing: Learn to edit your work critically. Look for clarity, coherence, conciseness, and correctness. 6. Study Writing Techniques: - Workshops and Courses: Enroll in writing workshops or online courses. Websites like Coursera, Udemy, and edX offer courses on various aspects of writing. - Books on Writing: Read books about writing, such as "On Writing" by Stephen King or "Bird by Bird" by Anne Lamott. 7. Practice Different Styles: - Genres: Experiment with different genres (e.g., poetry, essays, short stories, technical writing) to find your strengths and preferences. - Perspectives: Write from different perspectives and in various voices to develop versatility. 8. Use Writing Tools: - Software: Use tools like Grammarly, Hemingway Editor, or ProWritingAid to help with grammar and style. - Outlining: Use outlining tools to organize your thoughts before you start writing. 9. Stay Motivated: - Set Goals: Set specific, achievable writing goals (e.g., write 500 words a day, complete a short story in a month). - Celebrate Progress: Acknowledge and celebrate your progress to stay motivated. 10. Read Aloud: - Hearing Your Writing: Reading your work aloud can help you catch errors and awkward phrasing that you might miss when reading silently. Improving your writing skills is a continuous process, and persistence is key. By integrating these strategies into your routine, you'll gradually become a more confident and effective writer. #sirjimmy#teamjimmy#writingskills#englishmadeeasy#truewisdom