[issue10049] Add a "no-op" (null) context manager to contextlib

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Actually, the singleton idea isn't a bad one, but I'd go one step further and skip the factory function as well. So change that to be:

class NullContext():
   ... # as per nullcontext in my last message

nullcontext = NullContext()

(with the example in the docstring adjusted accordingly)

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