On 3/7/2012 5:35 PM, Peter Kleiweg wrote:
Dave Angel schreef op de 7e dag van de lentemaand van het jaar 2012:
On 03/07/2012 02:41 PM, Peter Kleiweg wrote:
I want to write out some binary data to stdout in Python3. I
thought the way to do this was to call detach on sys.stdout. But
apparently, you can't. Here is a minimal script:
#!/usr/bin/env python3.1
import sys
fp = sys.stdout.detach()
Not yet using fp in any way, this script gives the following error:
Exception ValueError: 'underlying buffer has been detached' in
Same in Python 3.1.4 and Python 3.2.2
So, what do I do if I want to send binary data to stdout?
sys.stdout.write( some_binary_data )
TypeError: must be str, not bytes
Right, you can only send binary data to file opened in binary mode. The
default sys.stdout is in text mode. I am pretty sure that remains true
even if stdout is redirected. (You did not mention your OS.) You would
have to open such a file and make sys.stdout point to it.
sys.stdout = my_binary_file.
But why do that? Just open the file and write to it directly without the
above.
--
Terry Jan Reedy
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