On 6/29/2013 5:21 PM, Ian Kelly wrote:
On Sat, Jun 29, 2013 at 2:53 PM, Terry Reedy <tjre...@udel.edu> wrote:
# The alternative for either program or people is a 1-pass + backtracking
process where all understandings are kept provisional until the end of the
body and revised as required. 2 passes are simpler.
Or simply an explicit declaration of scope at the beginning of the
function definition.
One of the reasons I switched to Python was to not have to do that, or
hardly ever. For valid code, an new declaration is hardly needed.
Parameters are locals. If the first use of another name binds it (and
that includes import, class, and def), it is local. If the first use of
does not bind it, it had better not be local (because if it is, there
well be an exception). If there are branches, each should be consistent
with the others. One should only need two readings to understand and fix
unbound local errors.
--
Terry Jan Reedy
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