Web Reference: Jul 23, 2025 · In this article, we will discuss what the psycopg2 OperationalError is, explore three common reasons for this error with code examples, and provide approaches to solve these issues with the correct code. I had to uninstall and reinstall psycopg2 to get it to use the correct libpq.dylib, which -- in turn -- used the correct unix socket path. I had this problem after switching to PostgreSQL packages from PGDG repository. Adding --no-binary to requirements.txt and adding pg_config 's dir to PATH resolved it. Try change port to 5433 instead of 5432. Feb 9, 2010 · The content of the module is generated from the PostgreSQL source code and includes classes for every error defined by PostgreSQL in versions between 9.1 and 15.
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