Errors at Python program exit: "close failed in file object destructor"; "sys.excepthook is missing"

Question

After the last line (print statement) in my python code, I get the following error:

close failed in file object destructor:
sys.excepthook is missing
lost sys.stderr

Anyone know where this might be coming from?

Update: My python code is extremely long but I will post portions that may have something to do with this error:

For one, near the beginning of the process I redirect stdout and stderr to a log file like this:

so = se = open(logfile, 'w', 0)                       
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0) 
os.dup2(so.fileno(), sys.stdout.fileno())           
os.dup2(se.fileno(), sys.stderr.fileno())

I do this all the time though and have never run into this error but it seems the most likely reason I'm seeing this.

Solution 1

Adding the following statement to the very end of my main function fixes this issue for me:

try:
    sys.stdout.close()
except:
    pass
try:
    sys.stderr.close()
except:
    pass

Solution 2

Doing flush and close worked for me.

sys.stdout.flush()
sys.stdout.close()

sys.stderr.flush()
sys.stderr.close()