Author Jimbofbx
Recipients Jimbofbx
Date 2011-05-06.17:44:36
SpamBayes Score 3.84237e-12
Marked as misclassified No
Message-id <1304703877.7.0.898555574271.issue12020@psf.upfronthosting.co.za>
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Content
When upgrading from Python 3.1 to Python 3.2 I noticed that when my program closed it printed out a non-consequential AttributeError Exception. My program had a custom class that replaced stdout and stderr for use in a piped program (it flushed the buffer after every print statement)

I was able to reduce my code down to this simple test case that will reproduce the issue. Note that this doesn't show up in idle.

code:
import sys
from time import sleep
import subprocess

python31loc = r"C:\python31\python.exe";
python32loc = r"C:\python32\python.exe";
myname = "attributeError.py";

class FlushFile(object):
    #"""Write-only flushing wrapper for file-type objects."""
    def __init__(self, f):
        self.f = f
        try:
            self.encoding = f.encoding;
        except:
            pass;
    def write(self, x):
        self.f.write(x)
        self.f.flush()

# sets stdout and stderr to autoflush
def setAutoFlush():
    if sys.__stdout__ != None: # will be None in IDLE
        sys.stdout = FlushFile(sys.__stdout__);
        sys.stderr = FlushFile(sys.__stderr__);

if __name__ == "__main__":
    setAutoFlush();
    if(len(sys.argv) == 1):
        print("Testing python 3.1");
        output = subprocess.check_output("%s %s -output" % (python31loc, myname));
        print("Should see no error");
        print("Testing python 3.2");
        output = subprocess.check_output("%s %s -output" % (python32loc, myname));
        print("Should see no error");
        sleep(16);


Output:
Testing python 3.1
Should see no error
Testing python 3.2
Exception AttributeError: 'flush' in <__main__.FlushFile object at 0x00C347F0> i
gnored
Should see no error
History
Date User Action Args
2011-05-06 17:44:37Jimbofbxsetrecipients: + Jimbofbx
2011-05-06 17:44:37Jimbofbxsetmessageid: <1304703877.7.0.898555574271.issue12020@psf.upfronthosting.co.za>
2011-05-06 17:44:36Jimbofbxlinkissue12020 messages
2011-05-06 17:44:36Jimbofbxcreate