pipenv: remove black to restore compatibility with python3.5

.github/workflows/code-format.yml

@@ -10,7 +10,6 @@ jobs:
     - uses: actions/setup-python@v1
       with:
         python-version: 3.7
-    - run: pip install --upgrade pipenv>=2018.10.9
-    - run: pipenv install --deploy --dev
-    - run: pipenv graph
-    - run: pipenv run black --check .
+    - run: pip install black==19.10b0
+    - run: pip freeze
+    - run: black --check .

Pipfile

@@ -10,7 +10,9 @@ freesurfer-stats = {editable = true, path = "."}
 pandas = "<1"
 
 [dev-packages]
-black = "==19.10b0"
+# black requires python>=3.6
+# https://github.com/psf/black/commit/e74117f172e29e8a980e2c9de929ad50d3769150#diff-2eeaed663bd0d25b7e608891384b7298R51
+#black = "==19.10b0"
 isort = "*"
 # >=2.3.0 due to false+ assignment-from-no-return
 # https://github.com/PyCQA/pylint/issues/2694

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "9438a31d4f660b467cdfcd236820862ab2280a7d2f90aaa730e47bece555e643"
+            "sha256": "2a979d1b7c6b04e20ac4e271ea948c9429ac4ecf45fe306b6e0c898756c6bb33"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -94,13 +94,6 @@
         }
     },
     "develop": {
-        "appdirs": {
-            "hashes": [
-                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
-                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
-            ],
-            "version": "==1.4.4"
-        },
         "astroid": {
             "hashes": [
                 "sha256:4c17cea3e592c21b6e222f673868961bad77e1f985cb1694ed077475a89229c1",
@@ -122,21 +115,6 @@
             ],
             "version": "==19.3.0"
         },
-        "black": {
-            "hashes": [
-                "sha256:1b30e59be925fafc1ee4565e5e08abef6b03fe455102883820fe5ee2e4734e0b",
-                "sha256:c2edb73a08e9e0e6f65a0e6af18b059b8b1cdd5bef997d7a0b181df93dc81539"
-            ],
-            "index": "pypi",
-            "version": "==19.10b0"
-        },
-        "click": {
-            "hashes": [
-                "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a",
-                "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"
-            ],
-            "version": "==7.1.2"
-        },
         "coverage": {
             "hashes": [
                 "sha256:00f1d23f4336efc3b311ed0d807feb45098fc86dee1ca13b3d6768cdab187c8a",
@@ -237,13 +215,6 @@
             ],
             "version": "==20.4"
         },
-        "pathspec": {
-            "hashes": [
-                "sha256:7d91249d21749788d07a2d0f94147accd8f845507400749ea19c1ec9054a12b0",
-                "sha256:da45173eb3a6f2a5a487efba21f050af2b41948be6ab52b6a1e3ff22bb8b7061"
-            ],
-            "version": "==0.8.0"
-        },
         "pluggy": {
             "hashes": [
                 "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0",
@@ -297,32 +268,6 @@
             "index": "pypi",
             "version": "==2.9.0"
         },
-        "regex": {
-            "hashes": [
-                "sha256:1386e75c9d1574f6aa2e4eb5355374c8e55f9aac97e224a8a5a6abded0f9c927",
-                "sha256:27ff7325b297fb6e5ebb70d10437592433601c423f5acf86e5bc1ee2919b9561",
-                "sha256:329ba35d711e3428db6b45a53b1b13a0a8ba07cbbcf10bbed291a7da45f106c3",
-                "sha256:3a9394197664e35566242686d84dfd264c07b20f93514e2e09d3c2b3ffdf78fe",
-                "sha256:51f17abbe973c7673a61863516bdc9c0ef467407a940f39501e786a07406699c",
-                "sha256:579ea215c81d18da550b62ff97ee187b99f1b135fd894a13451e00986a080cad",
-                "sha256:70c14743320a68c5dac7fc5a0f685be63bc2024b062fe2aaccc4acc3d01b14a1",
-                "sha256:7e61be8a2900897803c293247ef87366d5df86bf701083b6c43119c7c6c99108",
-                "sha256:8044d1c085d49673aadb3d7dc20ef5cb5b030c7a4fa253a593dda2eab3059929",
-                "sha256:89d76ce33d3266173f5be80bd4efcbd5196cafc34100fdab814f9b228dee0fa4",
-                "sha256:99568f00f7bf820c620f01721485cad230f3fb28f57d8fbf4a7967ec2e446994",
-                "sha256:a7c37f048ec3920783abab99f8f4036561a174f1314302ccfa4e9ad31cb00eb4",
-                "sha256:c2062c7d470751b648f1cacc3f54460aebfc261285f14bc6da49c6943bd48bdd",
-                "sha256:c9bce6e006fbe771a02bda468ec40ffccbf954803b470a0345ad39c603402577",
-                "sha256:ce367d21f33e23a84fb83a641b3834dd7dd8e9318ad8ff677fbfae5915a239f7",
-                "sha256:ce450ffbfec93821ab1fea94779a8440e10cf63819be6e176eb1973a6017aff5",
-                "sha256:ce5cc53aa9fbbf6712e92c7cf268274eaff30f6bd12a0754e8133d85a8fb0f5f",
-                "sha256:d466967ac8e45244b9dfe302bbe5e3337f8dc4dec8d7d10f5e950d83b140d33a",
-                "sha256:d881c2e657c51d89f02ae4c21d9adbef76b8325fe4d5cf0e9ad62f850f3a98fd",
-                "sha256:e565569fc28e3ba3e475ec344d87ed3cd8ba2d575335359749298a0899fe122e",
-                "sha256:ea55b80eb0d1c3f1d8d784264a6764f931e172480a2f1868f2536444c5f01e01"
-            ],
-            "version": "==2020.5.14"
-        },
         "six": {
             "hashes": [
                 "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",