> [n for n in range(0,10) if is_Integer(n+1)]
snip
> [n for n in range(0,10) if is_Integer(n)]
You are doing this from the command line, yes? The first is getting
preparsed, so that 1 is not a python int, it is a sage Integer:
sage: preparse('[n for n in range(0,10) if is_Integer(n+1)]')
'[n for n in range(Integer(0),Integer(10)) if is_Integer(n+Integer(1))]'
sage: preparse('[n for n in range(0,10) if is_Integer(n)]')
'[n for n in range(Integer(0),Integer(10)) if is_Integer(n)]'
As for the warnings not being printed, in the loop you are maybe not
considered to be in Python global scope? I cannot say.
Nick
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