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?
Thanks in advance,
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