[Python] Not Everything from STDERR/STDOUT Being Redirected

[dodle]

I've got a class that redirects stdout/stderr to itself:

class OutputLog(wx.TextCtrl):
    def __init__(self, parent, id=-1):
        wx.TextCtrl.__init__(self, parent, id, style=wx.TE_MULTILINE|wx.TE_READONLY)
        self.SetBackgroundColour(u'black')
        self.SetForegroundColour(u'white')
        self.stdout = sys.stdout
        self.stderr = sys.stderr
    
    def write(self, string):
        self.AppendText(string)
    
    def ToggleOutput(self, event=None):
        if (sys.stdout == self):
            sys.stdout = self.stdout
            sys.stderr = self.stderr
        else:
            sys.stdout = self
            sys.stdout = self 

The problem is that not everything is redirected to it. It works when I use the "print" function, but not for system calls or errors.

Here is an example:

...
    self.outputlog = OutputLog(self)
    self.outputlog.ToggleOutput() # Set stdout/stderr to print to log
...
  def PrintSomething(self, event=None):
    print 'Hello from Python'
    os.system('echo "Hello from system"')
    subprocess.Popen(['echo', 'Hello from subprocess'])
    print hello # Force a NameError 

"Hello from Python" is printed in the output log, but "Hello from system", "Hello from subprocess" and the error traceback are printed in the system terminal. Is there a way to redirect all of this as well?

----- EDIT -----

I figured out how to manually do tracebacks, but it would be nice if all tracebacks were automatically sent to the OutputLog:

...
    try:
      print hello
    except NameError:
      traceback.print_exc(file=sys.stdout) # Can also use "file=self.outputlog" 

----- EDIT -----

Okay, figured out how to get it from os and subprocess modules, although once again it is not automatic, I have to put the output into a variable then print it:

...
    o = os.popen('echo "Hello from system"').read()
    print o
    s = subprocess.Popen(['echo', 'Hello from subprocess'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    print s.stdout.read() 

I'm not going to mark this thread as solved for a couple of days in case someone has a better answer. Is there a way to redirect the output of os.popen or subprocess.Popen without having to put it into a variable?

[StephenF]

If you want to globally specify the IO streams you can do so at launch time or by writing a simple launch script.

$ python 2>&1 >myfile
Python 2.7.2 (default, Oct 24 2011, 11:20:40) 
[GCC 4.5.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.system("echo hello")
>>> 
$ cat myfile
hello
0

The 0 is the return value from os.system which Python prints by default in interactive mode.

[Bodsda]

...
    o = os.popen('echo "Hello from system"').read()
    print o 

I'm not going to mark this thread as solved for a couple of days in case someone has a better answer. Is there a way to redirect the output of os.popen or subprocess.Popen without having to put it into a variable?

Your almost there, what happens if you don't do the variable assignment?

print os.popen('echo "Hello from system"').read()

Bodsda

[dodle]

If you want to globally specify the IO streams you can do so at launch time or by writing a simple launch script.

That's sounds pretty good, I'm going to look into that.

@Bodsda
I knew that I could use the print function without first putting the output into a variable, but I wanted it to go to stdout/stderr without having to call the print function at all.