`my_dict = (json.load(f) with open(filename.json, "r") as f)` Would that be called a generator expression / comprehension context manager?
https://docs.python.org/3/reference/datamodel.html#context-managers https://docs.python.org/3/library/contextlib.html PEP 343 added the "with" statement. Tests that would need to be extended / that may be useful references: https://github.com/python/cpython/blob/master/Lib/test/test_with.py https://github.com/python/cpython/blob/master/Lib/test/test_contextlib.py https://github.com/python/cpython/blob/master/Lib/test/test_contextlib_async.py https://github.com/python/cpython/blob/master/Lib/test/test_grammar.py#L1701 test_with_statement https://github.com/python/cpython/blob/master/Lib/test/test_grammar.py#L1864 test_async_with https://github.com/python/cpython/blob/master/Grammar/python.gram Would there be any new scope issues? On Mon, Sep 28, 2020, 11:12 AM Eric Wieser <wieser.eric+nu...@gmail.com> wrote: > This reminds me of a previous proposal I can't remember if I hit the list > with, allowing > > with open(filename.json, "r") as f: > my_dict = json.load(f) > > to be spelt as a single expression: > > my_dict = (json.load(f) with open(filename.json, "r") as f) > > Obviously this would be more useful in comprehensions, but it might > encourage people not to lazily write `json.load(open("filename.json", > "r"))` because they want an expression, and end up leaving files open. > > Eric > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/QR233SIBDHWDZLKWURUHXG37BDWJHA7Z/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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