Version Compatibility

Reference examples tested with: BioPython 1.83+, Entrez Direct 21.0+

Before using code patterns, verify installed versions match. If versions differ:

• Python: pip show <package> then help(module.function) to check signatures

If code throws ImportError, AttributeError, or TypeError, introspect the installed package and adapt the example to match the actual API rather than retrying.

Batch Downloads

"Download thousands of sequences from NCBI" → Search NCBI with history server, then batch-fetch results with rate limiting and retry logic.

• Python: Entrez.esearch(), Entrez.efetch() with usehistory='y' (BioPython)

Download large numbers of records from NCBI efficiently using the history server, batching, and proper rate limiting.

Required Setup