On 6/18/2010 4:26 PM, Justin Park wrote:
The problem is simple.
I have 50taxa2HGT_1.txt in the current directory,
and I can open it using any text editor (which indicates there actually
is.)

And I can read it in Python using
fd=open("./50taxa2HGT_1.txt", "r")
, and it actually got opened, because I can do
for line in fd:
...     print line

But when I change the file access mode into "a",
it returns an error message of "IOError: [Errno 9] Bad file descriptor. "

What have I done wrong?

You did not copy and paste the *complete* error message, which would say whether the error occurred when opening or reading the file.

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