Hi all,

I want to write a Python script that will help me select upstream and downstream proteins sequences.

I have a blastp results file (.txt) that contains protein IDs in the first column.

On the other hand, I have a file containing all protein sequences (ID+sequences)

I want to "extract" protein sequences from the blastp results but also extract the proteins located before and after ("guilt by association" approach")

I am releatively new to Python so I just wanted advices on how to proceed? If you have any suggestions, please let me know.

Thank you so much in advance for your help!