okay, I think somethings do....while is useful, but why python didn't
have it?

in lisp, we can (while (progn ....))
and in all other language we have do...while.
but in python, we only can:
cond = 1
while cond:
    cond = 0
    .....
    if ....: cond = 1

has any polite way to handle this?
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