I wrote one, but it is in Italian, sorry! Coming from Python, the
most
disturbing thing about Scheme is the abundance of implementations.
Basically,
you have to chose an implentation and stick to it. It is possible that
the R6RS
will improve the situation, but right now portability between
implementations
for non-trivial code is still a dream. An implementation which is
particularly
practical and with many libraries is Chicken Scheme (which also has
eggs,
similar to Python eggs but better, since Chicken got them first
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