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I'm attempting to pin black to `black==21.12b0` (a...
# general
i
I'm attempting to pin black to 
black==21.12b0
(as was configured by default in pants 2.9) in my pants.toml I have the following
Copy code
[GLOBAL]
pants_version = "2.11.0"

backend_packages.add = [
  "pants.backend.python",
  "pants.backend.python.lint.black",
]

[python]
interpreter_constraints = [">=3.9"]
tailor_requirements_targets = false
enable_resolves = true # for use with lock file
resolves = { python-default = "3rdparty/python/python-default.lock" }
default_resolve = "python-default"
lockfile_generator = "pex"

[coverage-py]
interpreter_constraints = [">=3.9"]

[test]
use_coverage = true

[pytest]
version = "pytest>=6.2.4,<6.3"
extra_requirements.add = [
  "pytest-django>=4,<5",
]
lockfile="3rdparty/python/pytest.lock"

[black]
version = "black==21.12b0"
interpreter_constraints = [">=3.9"]
lockfile="3rdparty/python/black.lock"
✅ 1
I'm getting the following error when trying to run lint goal.
Copy code
➜  monorepo git:(developer-tooling/pants-upgrade) ✗ ./pantsv2 lint ::
10:56:30.00 [ERROR] Completed: Lint with Black - black failed (exit code 1).
Traceback (most recent call last):
  File ".cache/pex_root/venvs/c0b86b57995eab6f84dfbd06344b0899b7dc2b2f/80f5c4dc0e77a5b728d2e9547d721df713b9ebc9/pex", line 182, in <module>
    sys.exit(func())
  File "/Users/KHowa8/.cache/pants/named_caches/pex_root/venvs/c0b86b57995eab6f84dfbd06344b0899b7dc2b2f/80f5c4dc0e77a5b728d2e9547d721df713b9ebc9/lib/python3.9/site-packages/black/__init__.py", line 1372, in patched_main
    patch_click()
  File "/Users/KHowa8/.cache/pants/named_caches/pex_root/venvs/c0b86b57995eab6f84dfbd06344b0899b7dc2b2f/80f5c4dc0e77a5b728d2e9547d721df713b9ebc9/lib/python3.9/site-packages/black/__init__.py", line 1358, in patch_click
    from click import _unicodefun
ImportError: cannot import name '_unicodefun' from 'click' (/Users/KHowa8/.cache/pants/named_caches/pex_root/venvs/c0b86b57995eab6f84dfbd06344b0899b7dc2b2f/80f5c4dc0e77a5b728d2e9547d721df713b9ebc9/lib/python3.9/site-packages/click/__init__.py)


✕ black failed.
h
Hm. And to double check, did you 
generate-lockfiles
or 
generate-lockfiles --resolve=black
?
i
I did. Twice!
h
Okay fishy. Could you please share the contents of 
black.lock
?
i
Copy code
// This lockfile was autogenerated by Pants. To regenerate, run:
//
//    ./pantsv2 generate-lockfiles --resolve=black
//
// --- BEGIN PANTS LOCKFILE METADATA: DO NOT EDIT OR REMOVE ---
// {
//   "version": 2,
//   "valid_for_interpreter_constraints": [
//     "CPython>=3.9"
//   ],
//   "generated_with_requirements": [
//     "black==21.12b0",
//     "typing-extensions>=3.10.0.0; python_version < \"3.10\""
//   ]
// }
// --- END PANTS LOCKFILE METADATA ---

{
  "allow_builds": true,
  "allow_prereleases": false,
  "allow_wheels": true,
  "build_isolation": true,
  "constraints": [],
  "locked_resolves": [
    {
      "locked_requirements": [
        {
          "artifacts": [
            {
              "algorithm": "sha256",
              "hash": "a615e69ae185e08fdd73e4715e260e2479c861b5740057fde6e8b4e3b7dd589f",
              "url": "<https://files.pythonhosted.org/packages/9b/27/b2f98b627738b02dcac06ae9e2ab13f14ab906fe6dd6366050c76883d4b5/black-21.12b0-py3-none-any.whl>"
            },
            {
              "algorithm": "sha256",
              "hash": "77b80f693a569e2e527958459634f18df9b0ba2625ba4e0c2d5da5be42e6f2b3",
              "url": "<https://files.pythonhosted.org/packages/f7/60/7a9775dc1b81a572eb26836c7e77c92bf454ada00693af4b2d2f2614971a/black-21.12b0.tar.gz>"
            }
          ],
          "project_name": "black",
          "requires_dists": [
            "aiohttp>=3.7.4; extra == \"d\"",
            "click>=7.1.2",
            "colorama>=0.4.3; extra == \"colorama\"",
            "dataclasses>=0.6; python_version < \"3.7\"",
            "ipython>=7.8.0; extra == \"jupyter\"",
            "mypy-extensions>=0.4.3",
            "pathspec<1,>=0.9.0",
            "platformdirs>=2",
            "tokenize-rt>=3.2.0; extra == \"jupyter\"",
            "tomli<2.0.0,>=0.2.6",
            "typed-ast>=1.4.2; python_version < \"3.8\" and implementation_name == \"cpython\"",
            "typed-ast>=1.4.3; extra == \"python2\"",
            "typing-extensions!=3.10.0.1; python_version >= \"3.10\"",
            "typing-extensions>=3.10.0.0",
            "uvloop>=0.15.2; extra == \"uvloop\""
          ],
          "requires_python": ">=3.6.2",
          "version": "21.12b0"
        },
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          "requires_dists": [
            "colorama; platform_system == \"Windows\"",
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            "furo>=2021.7.5b38; extra == \"docs\"",
            "proselint>=0.10.2; extra == \"docs\"",
            "pytest-cov>=2.7; extra == \"test\"",
            "pytest-mock>=3.6; extra == \"test\"",
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      ],
      "platform_tag": [
        "cp310",
        "cp310",
        "macosx_12_0_arm64"
      ]
    }
  ],
  "path_mappings": {},
  "pex_version": "2.1.84",
  "prefer_older_binary": false,
  "requirements": [
    "black==21.12b0",
    "typing-extensions>=3.10.0.0; python_version < \"3.10\""
  ],
  "requires_python": [
    ">=3.9"
  ],
  "resolver_version": "pip-2020-resolver",
  "style": "universal",
  "transitive": true,
  "use_pep517": null
}
For now I'm adding "skip_black=True" to BUILD files rather than re-formatting all of the files. It's not ideal, but I'll fast-follow w/ a format commit.
I'd really love to pin the version but apparently, that's not a thing for black today.
h
Sorry for my delay! Trying to reproduce
Excellent, I reproduce. Thanks for the report! I'll look into this
@incalculable-yacht-75851 figured it out. https://stackoverflow.com/questions/71673404/importerror-cannot-import-name-unicodefun-from-click Add this:
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[black]
# We must pin Click until we can upgrade Black's version. See <https://stackoverflow.com/questions/71673404/importerror-cannot-import-name-unicodefun-from-click>
extra_requirements.add = ["click<8.1"]
Then 
./pants generate-lockfiles --resolve=black
(this isn't a pants or pex issue; Black wasn't metadata correctly)
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