[BioPython] PDBParser

[Sam Khalouei]

Hello,

I'm working on a PDBParser example in the biopython documentaion; 1fat.

from Bio.PDB.PDBParser import PDBParser
p=PDBParser(PERMISSIVE=1)
structure_id="1fat"
structure=p.get_structure(structure_id, "filename")
first_model=structure[0]

everything works fine upto here but then

chain_A=first_model["A"]

doesn't work and gives this error;

Traceback (most recent call last):
  File "<pyshell#47>", line 1, in -toplevel-
    chain=firstModel["A"]
  File "C:\Python23\Lib\site-packages\Bio\PDB\Entity.py", line 33, in 
__getitem__
    return self.child_dict[id]
KeyError: 'A'


Could someone please tell me what could be wrong.

Thanks alot,
Sam K.


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