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Entrez is a simple Python interface to query the biological databases kept at the NCBI. It uses the Entrez Programming Utilities (E-utilities), nine server-side programs that access the Entrez query and database system at the National Center for Biotechnology Information (NCBI).

The interface is in the file entrez.py. It contains:

• equery(tool[, ...]) - Yield the response of a query with the given tool.
• eselect(tool, db[, ...]) - Return a dict that references the elements selected with tool over database db.
• eapply(tool, db, elems[, retmax, ...]) - Yield the response of applying a tool on db for the selected elements.
• on_search(db, term, tool[, db2, ...]) - Yield the response of applying a tool over the results of a search query.