why no color output with Python?

I have a batch file which calls .Net solution to build the project. On the dos console window, the warning and error will be in different color, green and red开发者_Python百科, looks nice. When the batch file called from Python, no color at all, all in a single color. Is it possible to get the same colorful result with python? my call to the batch file is like this:

p = subprocess.Popen('manualBuild.bat', shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) 
for line in p.stdout.readlines(): 
    print line, 
retval = p.wait()

thanks

Some programs test to see if they're actually connected to a console/terminal, and suppress attribute changes if they're not in order to make it easier to parse/process the output. I know that on *nix systems you can use unbuffer to fool the program, but I don't know if there's a Windows equivalent.

If this were UNIX, I'd suggest you don't get the output in a variable but just let the program print it out (ie. don't pass stdout to subprocess). Maybe you can try that once?