[Tutor] Logical Structure of Snippet

[Alan Gauld]

"Spyros Charonis" <s.charonis at gmail.com> wrote

>>P1; ICA1_HUMAN
> AAEVDTG..... (A very long sequence of letters)
>
> I must extract one of the data fields from the database (done this)
> and place it in the sequence file (structure shown above). The 
> relevant
> database fields go like:
>
> tt; ICA1_HUMAN       Description
> tt; ICA1_BOVIN         Description
> tt; ICA2_HUMAN       Description
>
> What I would like is to extract the tt; fields (I already have code 
> for
> that) and then to read through the sequence file and insert the
> TT field corresponding to the >P1 header right underneath
> the >P1 header. Basically, I need a newline everytime >P1
> occurs in the sequence file and I need to paste
> its corresponding TT field in that newline


> the pseudocode would go like this:

modified to:

for line sequence file:
   insert line
   if line.startswith('>P1; ICA ....)
       go to list with extracted tt; fields*
       find the one with the same query (tt; ICA1 ...)*
       insert this field as a newline

> The steps marked * are the ones I am not sure how to implement. What
> logical structure would I need to make Python match a tt; field

What about a dictionary keyed by field type?

HTH,


-- 
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/