New submission from James Hutchison <[email protected]>:
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
----------
components: IO, Windows
messages: 135347
nosy: Jimbofbx
priority: normal
severity: normal
status: open
title: Attribute error with flush on stdout,stderr
type: behavior
versions: Python 3.2
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Python tracker <[email protected]>
<http://bugs.python.org/issue12020>
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