https://dekhohatke.com/Practical coding tutorials and fixes for Python, Android, C++, JavaScript and bots.enThu, 29 Oct 2026 06:00:00 +0000https://dekhohatke.com/blog/telegram-bot-409-conflict-getupdates/https://dekhohatke.com/blog/telegram-bot-409-conflict-getupdates/Wed, 28 Oct 2026 06:00:00 +0000BotTelegram bot crashing with 409 Conflict? Find the second running copy, clear a stuck webhook and make sure only one instance ever polls.https://dekhohatke.com/blog/render-no-open-ports-detected-flask-gunicorn/https://dekhohatke.com/blog/render-no-open-ports-detected-flask-gunicorn/Mon, 26 Oct 2026 06:00:00 +0000AutomationDeploy fails with Port scan timeout on Render? Bind to 0.0.0.0 and the PORT variable, fix the gunicorn command and run a bot with a health server.https://dekhohatke.com/blog/flask-cors-error-static-site-api/https://dekhohatke.com/blog/flask-cors-error-static-site-api/Sat, 24 Oct 2026 06:00:00 +0000WebsiteBlocked by CORS policy in the browser console? Learn what preflight is and fix it in Flask, including credentials, redirects and error responses.https://dekhohatke.com/blog/beautifulsoup-nonetype-no-attribute-get-text/https://dekhohatke.com/blog/beautifulsoup-nonetype-no-attribute-get-text/Thu, 22 Oct 2026 06:00:00 +0000ScrapperWhy find and select_one return None, how to debug the real HTML your script receives and how to write scraping code that survives missing elements.https://dekhohatke.com/blog/scrape-javascript-page-hidden-json-api/https://dekhohatke.com/blog/scrape-javascript-page-hidden-json-api/Tue, 20 Oct 2026 06:00:00 +0000ScrapperWhen a page loads data with JavaScript, the HTML you download is empty. Use DevTools to find the JSON request behind the page and call it in Python.https://dekhohatke.com/blog/recyclerview-no-adapter-attached-skipping-layout/https://dekhohatke.com/blog/recyclerview-no-adapter-attached-skipping-layout/Sun, 18 Oct 2026 06:00:00 +0000AppsA seven point checklist for an empty RecyclerView in Java: adapter, LayoutManager, item count, row layout height, data refresh and ListAdapter traps.https://dekhohatke.com/blog/cpp-segmentation-fault-asan-gdb/https://dekhohatke.com/blog/cpp-segmentation-fault-asan-gdb/Fri, 16 Oct 2026 06:00:00 +0000AppsStop guessing why your program prints Segmentation fault. Reproduce it, read an AddressSanitizer report, get a gdb backtrace and fix the usual causes.https://dekhohatke.com/blog/cron-job-not-running-python-script/https://dekhohatke.com/blog/cron-job-not-running-python-script/Wed, 14 Oct 2026 06:00:00 +0000AutomationYour script works in the terminal but silently does nothing from cron. Fix PATH, working directory, percent signs, time zones and missing logs.https://dekhohatke.com/blog/python-csv-unicode-garbage-excel-utf8-sig/https://dekhohatke.com/blog/python-csv-unicode-garbage-excel-utf8-sig/Mon, 12 Oct 2026 06:00:00 +0000AutomationHindi text, the rupee sign or accented letters turn into odd symbols when a Python CSV opens in Excel. Understand why and fix it with one argument.https://dekhohatke.com/blog/python-requests-timeout-retry-fix/https://dekhohatke.com/blog/python-requests-timeout-retry-fix/Sat, 10 Oct 2026 06:00:00 +0000ScrapperA script that freezes or breaks on one bad response needs a timeout, a retry policy and a Session. Copy a hardened requests helper for any project.https://dekhohatke.com/blog/python-web-scraping-beautifulsoup/https://dekhohatke.com/blog/python-web-scraping-beautifulsoup/Mon, 09 Mar 2026 06:00:00 +0000ScrapperLearn web scraping with Python, requests and BeautifulSoup: download pages politely, parse HTML, follow pagination and save clean CSV data.https://dekhohatke.com/blog/android-java-recyclerview/https://dekhohatke.com/blog/android-java-recyclerview/Mon, 02 Mar 2026 06:00:00 +0000AppsBuild an Android RecyclerView in Java step by step: adapter, ViewHolder, click handling, adding and removing items, and DiffUtil.https://dekhohatke.com/blog/javascript-fetch-api-guide/https://dekhohatke.com/blog/javascript-fetch-api-guide/Mon, 23 Feb 2026 06:00:00 +0000WebsiteLearn JavaScript fetch: GET and POST, error handling, timeouts with AbortController, retries and calling your own backend from a static site.https://dekhohatke.com/blog/cpp-pointers-explained/https://dekhohatke.com/blog/cpp-pointers-explained/Mon, 16 Feb 2026 06:00:00 +0000AppsUnderstand C++ pointers with simple examples: addresses, dereferencing, nullptr, const, new and delete, and smart pointers.https://dekhohatke.com/blog/telegram-bot-report-python/https://dekhohatke.com/blog/telegram-bot-report-python/Sat, 24 Jan 2026 06:00:00 +0000BotSend alerts, files and error tracebacks from Python to your phone with a Telegram bot. Includes a reusable notifier module and security tips.https://dekhohatke.com/blog/schedule-python-scripts-render/https://dekhohatke.com/blog/schedule-python-scripts-render/Sat, 17 Jan 2026 06:00:00 +0000AutomationSchedule Python scripts with cron, a free Render web service or GitHub Actions, with working code, honest limits and security tips.https://dekhohatke.com/blog/automate-daily-tasks-python/https://dekhohatke.com/blog/automate-daily-tasks-python/Sat, 10 Jan 2026 06:00:00 +0000AutomationAutomate daily tasks with Python: organise folders, delete old files, rename photos and send reports, using safe dry-run scripts.