When I had contact with TCL for a networking class in the 90's I already knew Python and didn't like that "everthing is a string" pathos.

For me the greatest TCL contribution was Ousterhout's dichotomy: https://en.wikipedia.org/wiki/Ousterhout%27s_dichotomy or by the author himself: https://web.stanford.edu/~ouster/cgi-bin/papers/scripting.pd...