Question

tempfile.mkstemp() returns:

a tuple containing an OS-level handle to an open file (as would be returned by os.open()) and the absolute pathname of that file, in that order.

How do I convert that OS-level handle to a file object?

The documentation for os.open() states:

To wrap a file descriptor in a ‘file object’, use fdopen().

So I tried:

>>> import tempfile >>> tup = tempfile.mkstemp() >>> import os >>> f = os.fdopen(tup[0]) >>> f.write('foo\n') Traceback (most recent call last):   File '<stdin>', line 1, in ? IOError: [Errno 9] Bad file descriptor 

Answer 1

You can use

os.write(tup[0], 'foo\n') 

to write to the handle.

If you want to open the handle for writing you need to add the ‘w’ mode

f = os.fdopen(tup[0], 'w') f.write('foo')