kash is takes place
in Sage.
sage: a = kash('32233')
sage: a
32233
In particular, a is not defined as part of the KASH
session itself.
sage: kash.eval('a')
"Error, the variable 'a' must have a value"
Use a.name() to get the name of the KASH variable:
sage: a.name() # somewhat random 'sage0' sage: kash(a.name()) 32233
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