Hi All
The original poster wanted, inside 'with' context management, to open
several files. Context management is, roughly speaking, deferred execution
wrapped in a try ... except .... statement.
The lambda construction also provides for deferred execution. Perhaps
something like
>>> with helper(lambda: open('a'), open('b'), open('c')) as a, b c:
>>> pass
would do what the original poster wanted, for a suitable value of helper.
It certainly gives the parentheses the OP wanted, without introducing new
syntax.
However, map also provides for deferred execution. It returns an iterable
(not a list).
>>> x = map(open, ['a', 'b', 'c'])
>>> x
<map object at 0x7f8cb5653b70>
>>> next(x)
FileNotFoundError: [Errno 2] No such file or directory: 'a'
So the OP could even write:
>>> with helper(map(open, ['a', 'b', 'c'])) as a, b, c:
>>> pass
for a (different) suitable value of helper.
I hope this helps.
--
Jonathan
URL: jfine2358.github.io
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