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If you get 'No module named 'psycopg'' in SQLAlchemy 2.1, add +psycopg2 to the URL—3 ways to fix it, and 9 SQL statements that will fail in psycopg 3 (measured in Docker)

I installed SQLAlchemy 2.1.1 and psycopg2-binary in a verification environment (Python 3.13 inside Docker). In that environment, passing a URL starting with postgresql:// to create_engine () caused it ...
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2026年9月29日 19:20

검증용 환경 (Docker 내 Python 3.13)에 SQLAlchemy 2.1.1과 psycopg2-binary를 설치했습니다. 해당 환경에서 postgresql://로 시작하는 URL을 create_engine ()에 전달하자 'ModuleNotFoundError: No module named 'psycopg'' 오류가 발생하며 중단되었습니다.