On Windows, Wish is built as a GUI-only application; it has no real standard output available. Tk fakes one for you though; just put this in your script to show the fake console:
console show
The fake console shows up by default when you launch without a script file, but launching with a script file doesn't show it (so your script file can implement an application, of course).
This can catch people out when they produce a lot of output on stdout
. Tk may well be keeping it all faithfully just in case the code does console show
later on, though it looks and smells a lot like a memory leak if you're not prepared for it…