Tutorials Technology - Tech Tutorials
Recent Publications
Python: Check if File or Directory Exists — os.path, pathlib, try/except (2026)
How to check if a file exists in Python using os.path.exists(), pathlib Path.exists(), and try/except. Complete guide with examples for files and directories.
SOLVED: function main is undeclared in the main package (Go)
Fix Go error "function main is undeclared in the main package". Causes: wrong package name, missing main(), running go run on wrong file, or build tags.
SOLVED: gpg signing failed: inappropriate ioctl for device
Fix "gpg signing failed: inappropriate ioctl for device" when doing git commit. Set GPG_TTY, restart gpg-agent, or use pinentry-mode loopback.
SOLVED: error: pg_config executable not found (psycopg2 pip install)
Fix "error: pg_config executable not found" when pip install psycopg2 fails. Install postgresql-dev headers or use psycopg2-binary instead.
IBM DB2 Administration Cheatsheet — Essential Commands (2026)
IBM DB2 LUW quick reference 2026. Commands for start/stop, connect, list databases, backup, users, locks, performance, and common error codes. DB2 11.1, 11.5, 12.x.