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Make Prettier preserve line ending type (#2244)
[etc/vim.git] / docs / the_black_code_style / future_style.md
1 # The (future of the) Black code style
2
3 ```{warning}
4 Changes to this document often aren't tied and don't relate to releases of
5 _Black_. It's recommended that you read the latest version available.
6 ```
7
8 ## Using backslashes for with statements
9
10 [Backslashes are bad and should be never be used](labels/why-no-backslashes) however
11 there is one exception: `with` statements using multiple context managers. Before Python
12 3.9 Python's grammar does not allow organizing parentheses around the series of context
13 managers.
14
15 We don't want formatting like:
16
17 ```py3
18 with make_context_manager1() as cm1, make_context_manager2() as cm2, make_context_manager3() as cm3, make_context_manager4() as cm4:
19     ...  # nothing to split on - line too long
20 ```
21
22 So _Black_ will eventually format it like this:
23
24 ```py3
25 with \
26      make_context_manager(1) as cm1, \
27      make_context_manager(2) as cm2, \
28      make_context_manager(3) as cm3, \
29      make_context_manager(4) as cm4 \
30 :
31     ...  # backslashes and an ugly stranded colon
32 ```
33
34 Although when the target version is Python 3.9 or higher, _Black_ will use parentheses
35 instead since they're allowed in Python 3.9 and higher.