Very basic Forth version implemented in Python
Here's what you can expect:
1 2
ok
. .
2 1 ok
.s
[] <- top of stack ok
2
ok
.
2 ok
emit
stack underflow !!
.
stack underflow !!
1 2 . .
2 1 ok
1 2 + .
3 ok
.s
[] <- top of stack ok
3
!!
: 3 2 1 + ;
ok
3 2 + .
5 ok