`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... 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+numpy@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-leave@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/QR233S... Code of Conduct: http://python.org/psf/codeofconduct/