[BioPython] Cookbook:RenameFasta

[Michiel De Hoon]

> If I revert back to the old code for this line, ie. replace
>    ' filename, basename = sys.argv'
> with
>    'filename = sys.argv[1] '
>    'basename = sys.argv[2]'
> 
> it works fine.

There is also a sys.argv[0]. So sys.argv is a list with (at least) three
elements.
If you do 'filename, basename = sys.argv', you have two variables on the
left-hand-side and three on the right-hand-side. Instead, you could do

temp, filename, basename = sys.argv # And ignore temp subsequently

or

filename, basename = sys.argv[1:]


--Michiel.

Michiel de Hoon
Center for Computational Biology and Bioinformatics
Columbia University
1150 St Nicholas Avenue
New York, NY 10032



-----Original Message-----
From: biopython-bounces at lists.open-bio.org on behalf of Mike Dyall-Smith
Sent: Thu 11/1/2007 5:52 PM
To: biopython at lists.open-bio.org
Subject: [BioPython] Cookbook:RenameFasta
 
Njm revised the code of Humberto at:
http://bio.scipy.org/wiki/index.php/RenameFastaSequences
to make it more idiomatic Python. I altered my discussion according
to the new code. However, when I tested it on a fasta file I get an  
error:

   File "REnameFasta2.py", line 6, in <module>
     filename, basename = sys.argv
ValueError: too many values to unpack

If I revert back to the old code for this line, ie. replace
   ' filename, basename = sys.argv'
with
    'filename = sys.argv[1] '
    'basename = sys.argv[2]'

it works fine.  I assume there is some subtle error in assigning two
names to sys.argv

Regards, Mike D-S

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