Error messages when using the Console Module

[peter]

I am developing code using the effbot Console module, which gives
control over the Windows terminal settings. My problem is that while
this module redirects standard output to a new console window, it
seems to redirect standard error messages to a black hole. So when my
new code fails, I have no error messages to assist in diagnosing the
problem. At times I have been reduced to writing new code a line at a
time!

I'm sure there is an easy solution to this problem, but googling has
yet to reveal it. Can anyone help?

Peter

 

[Christian Heimes]

I am developing code using the effbot Console module, which gives
control over the Windows terminal settings. My problem is that while
this module redirects standard output to a new console window, it
seems to redirect standard error messages to a black hole. So when my
new code fails, I have no error messages to assist in diagnosing the
problem. At times I have been reduced to writing new code a line at a
time!

Windows GUI apps don't have valid standard streams. stdin, stdout and
stderr aren't connected and their fileno is -1. I guess you have to
connect the streams manually when you create a console window. C code
can use freopen() but I don't know how to properly redirect the streams
from Python.

MSDN has probably some docs for you.

Christian

 

[Gabriel Genellina]

I am developing code using the effbot Console module, which gives
control over the Windows terminal settings. My problem is that while
this module redirects standard output to a new console window, it
seems to redirect standard error messages to a black hole. So when my
new code fails, I have no error messages to assist in diagnosing the
problem. At times I have been reduced to writing new code a line at a
time!

The Console module doesn't redirect standard output, AFAIK. You can do
that either from inside the script or when invoking it from the command
line:

import sys
sys.stdout = open("stdout.log","w")
sys.stderr = open("stderr.log","w")
print "This goes to stdout"
print >>sys.stderr, "This goes to stderr"

or:

python yourscript.py >stdout.log 2>stderr.log

To redirect all output to the same file, you can use

sys.stdout = sys.stderr = open("output.log","w")

or:
python yourscript.py >output.log 2>&1

The same applies to pythonw.exe too.

 

[peter]

import sys
sys.stdout = open("stdout.log","w")
sys.stderr = open("stderr.log","w")
print "This goes to stdout"
print >>sys.stderr, "This goes to stderr"

This did the trick. Thanks

Peter