[Biopython] Query

[isha srivastava]

    Hello,

    I am new user of BioPython.
    I have Downloaded the latest version of BioPython  i.e. BioPython 1.57.
    fallowed all the instructions according to tutorial.
    but wen i am running the program :

     >>> from Bio import SeqIO
     >>> for seq_record in SeqIO.parse("ls_orchid.fasta", "fasta"):
     ...         print seq_record.id
     ...         print repr(seq_record.seq)
     ...         print len(seq_record)
     ...


    it is showing error as fallows :-

    Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
     File "/usr/lib/pymodules/python2.6/Bio/SeqIO/__init__.py", line 424, in
parse
     raise TypeError("Need a file handle, not a string (i.e. not a
filename)")
    TypeError: Need a file handle, not a string (i.e. not a filename)

Sir, how to solve this error?
Kindly make a soon reply.


With due regards,
Isha