Why Tcl/Tk?

[Jerry He]

I'm a little curious, why does most scripting
languges(i.e. python and ruby) use Tcl/Tk rather than
wx or Fox as its standard GUI? Although I did notice
that the Vpython IDE that uses Tkinker starts up a lot
faster than the DrPython IDE that uses wxpython. But
that makes no sense, Tk is based on Tcl, a scripting
language, but wx is written in C++. 

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