efficient random access to fasta subsequences for Python 3

 Samtools provides a function "faidx" (FAsta InDeX), which creates a
 small flat index file ".fai" allowing for fast random access to any
 subsequence in the indexed FASTA file, while loading a minimal amount of
 the file in to memory. This Python module implements pure Python classes
 for indexing, retrieval, and in-place modification of FASTA files using
 a samtools compatible index. The pyfaidx module is API compatible with
 the pygr seqdb module. A command-line script "faidx" is installed
 alongside the pyfaidx module, and facilitates complex manipulation of
 FASTA files without any programming knowledge.
 .
 This package provides the Python 3 modules to access fasta files.