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Изворен канал @pythonotes · Post #32 · 7 фев.

Скорее всего уже слышали, что складывать строки через + это плохая практика. Падение производительности, и всё такое. Без лишних слов, давайте измерять: from timeit import timeit def t1(): # складываем 10 строк через + из переменной t = 'text' for _ in range(1000): s = t + t + t + t + t + t + t + t + t def t2(): # склеиваем список строк через метод join arr = ['text'] * 10 for _ in range(1000): s = ''.join(arr) def t3(): # складываем через + но не из переменной а непосредственно инлайн объекты for _ in range(1000): s = 'text' + 'text' + 'text' + ... # всего 10 раз Теперь каждую строку склейки запустим по 10М раз >>> timeit(t1, number=10000) 0.21951690399964718 >>> timeit(t2, number=10000) 1.4978306379998685 >>> timeit(t3, number=10000) 0.2213820789993406 Хм, а нам говорили что через "+" это плохо и медленно ))) 😁 Тут стоит учитывать, что речь идёт о склейке множества длинных строк. Давайте изменим условия: def t4(): t = 'text'*100 for _ in range(1000): s = t + t + t + t + t + t + t + t + t def t5(): arr = ['text'*100] * 10 for _ in range(1000): s = ''.join(arr) def t6(): for _ in range(1000): s = 'text'*100 + 'text'*100 + ... # всего 10 раз >>> timeit(t4, number=10000) 12.795130728000004 >>> timeit(t5, number=10000) 2.642637542999182 >>> timeit(t6, number=10000) 0.2184546610005782 Вот, уже другой разговор, сразу видна разница, в среднем в 6 раз. Но погодите, почему последний тест t6() по скорости такой же как и t3()? Ведь строки теперь в 100 раз длиннее! Это вопросы оптимизации кода, какие простые изменения ускоряют или замедляют выполнение программы. Мы столкнулись с примером обхода обращения к переменной. Например, именно так работает директива #define в С++, во время компиляции подставляя значение переменной вместо ссылки на неё. В Python это тоже работает, но часто ли вы сможете встретить такой способ работы со строками? К сожалению, способ почти только теоретический. В целом, тесты показали то, что мы хотели. Делаем выводы самостоятельно. Полный листинг 🌍 #tricks

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@sirJimmy · Post #28902 · 02.05.2022 г., 16:04

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A moment of patience in a moment of anger, prevents thousands of moments of regret. #truewisdom #selfmotivation #sirjimmy #teamjimmy

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@englishmeta1 · Post #250 · 26.06.2024 г., 10:40

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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

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English With Natives*

@sirjimmy · Post #31107 · 26.06.2024 г., 08:19

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