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<pre><code>>>> line = 'gi|1168222|sp|P46098.1|5HT3A_HUMAN'
>>> line.split('|')
['gi', '1168222', 'sp', 'P46098.1', '5HT3A_HUMAN']
>>> line.split('|')[3]
'P46098.1'
>>> line.split('|')[3].split('.')
['P46098', '1']
>>> line.split('|')[3].split('.')[0]
'P46098'
</code></pre>