In BioPython, sequences act similarly to normal string objects in Python as they are essentially a bunch of letters. While there a lot of methods that support both the Seq and string object, the Seq object differs from string objects in the methods that can be used on it. 

Sequences 

- Sequences
- Sequence Annotation Objects 
- Multiple Sequence Annotation Objects 
- BLAST

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BioPython is a group of modules that are useful for bioinformatics applications.

BioPython

This link leads to a page describing a large overview of BioPython and what it can do : 
http://biopython.org/DIST/docs/tutorial/Tutorial.html

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