multiple with open with long file names on same statement

[capitalaslash]

Describe the style change Better management of multiple with open on same statement

Examples in the current Black style

with open("a_very_long_file_name", "w") as a, open(
    "another_very_long_filename", "w"
) as b:
     pass

Desired style How do you think Black should format the above snippets:

with open("a_very_long_file_name", "w") as a, \
     open("another_very_long_filename", "w") as b:
    pass

Additional context yapf keeps the snippet as shown in the desired section, autopep8 adds an indentation for the second line. No solution is really great, but black's solution is really unreadable imho.

[sjohannes]

This duplicates #557 and #664 I think?

[ichard26]

Yeah fair enough - I didn't take a deep look as I didn't want to explain how we in fact have plans to handle multiple context managers better even though it looks like this better handling has landed already since this corner case is detailed in the documentation :-)

Thanks @sjohannes!

this counts as a bug as the expected behaviour has been documented

[capitalaslash]

The documentation saying that this should work is quite confusing...
I understand that #664 is still in the works and it requires 3.9, or will it work also on older versions?

[ichard26]

@capitalaslash yeah unfortunately the documentation has been added before the actual support has been added. The plan in #664 will work on older Python versions as we are special casing context managers. See #664 (comment) and the comment below it.