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
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