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Drawbacks
=========
If you intensively check sequence names exists in FASTA file using ``in`` operator on FASTA object like:
.. code:: python
>>> fa = pyfastx.Fasta('tests/data/test.fa.gz')
>>> # Suppose seqnames has 100000 names
>>> for seqname in seqnames:
>>> if seqname in fa:
>>> do something
This will take a long time to finish. Because, pyfastx does not load the index into memory, the ``in`` operating is corresponding to sql query existence from index database. The faster alternative way to do this is:
.. code:: python
>>> fa = pyfastx.Fasta('tests/data/test.fa.gz')
>>> # load all sequence names into a set object
>>> all_names = set(fa.keys())
>>> for seqname in seqnames:
>>> if seqname in all_names:
>>> do something
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