What does "Error: No module named psycopg2.extensions" mean?

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This error message means that your Python script is trying to use the psycopg2.extensions module, but this module is not installed on your system. psycopg2 is a Python library used for interacting with PostgreSQL databases, and psycopg2.extensions is a sub-module that contains additional functionality for working with database connections and transactions. In order to fix this error, you should install the psycopg2 library using pip or another package manager.