Use a with block to control export (public/private/__all__)

Presently, there is a lot of debate about how to do export control. An alternative suggestion is an export context manager that remains compatible with __all__: with export(): # Everything declared inside export blocks is exported. import math import sys as sys_alias CONST = 42 def not_exported(): pass # Outside block, not exported with export(): # Second block. def func(): return CONST print(func()) # You can put a non-declaration statement inside, but bad style! pr...