Black is not enforcing E: 501

[kunal5]

Below is my pyproject.toml file

[tool.black]
target-version = ['py27']
line-length = 120
include = '\.pyi?$'
exclude = '''
(
  /(
      \.eggs         # exclude a few common directories in the
    | \.git          # root of the project
    | \.hg
    | \.mypy_cache
    | \.tox
    | \.venv
    | _build
    | buck-out
    | build
    | dist
    | migrations
  )/
  | foo.py           # also separately exclude a file named foo.py in
                     # the root of the project
  | apps/core/migrations/0002_auto_20200707_1828.py
)
'''

Below is my .flake8 file

[flake8]
max-line-length = 120

I have attached a screenshot of a dict in python

In the above image, line no 319 the line-length has exceeded the max length(120) given in the file. Black is not formatting this and flake8 is throwing error every time. Why is black not enforcing E: 501?
You can see this in the error snapshot

Black version is : 19.10b0
Python: 2.7

Please help!!
Thanks

[hugovk]

What does that line 318 look like? Does it have a long string? Might be that Black couldn't make that line fit and you'll need to manually adjust it.

[kunal5]

@hugovk Please look at line 319... error message is showing line 318 because I deleted one line before taking a snapshot. Also, if I am placing the rest of the sentence after : in the next line then the black formatter is again formatting it and placing it on the same line

[hugovk]

Ah right! One idea is to append # noqa: E501 to the line:

thing = {
    a: a,
    looooooooooooooooooooooooooooooooooooooooooooooooooooong: looooooooooooooooooooooooooooooooooooooooooooooooooooong,  # noqa: E501
}

[kunal5]

@hugovk what I am currently doing is appending fmt: off and fmt: on between the lines which I don't want black to format. But is there a way that black always respect line-length property as given in pyproject.toml ? There are many instances in my project when black is formatting a file but it is not respecting line-length=120 property. One more instance is
Ideal solution should be as given below in line 6001-6002

But, when I run black formatter, it is formatting the above file as given in line 6001-6002 which is again not respecting line-length property

This is happening at many places and I would not want to append fmt: off and fmt: on everywhere. Can I do anything different to fix this issue

[JelleZijlstra]

There are indeed certain patterns where Black is not able to fit lines in the desired line length, usually involving unreasonably long identifiers. We should fix such cases so that Black does obey the desired line length limit.

#620 and #510 are similar previous issues.

[JelleZijlstra]

Going to call this a duplicate of #620.