René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ModuleNotFoundError: toml with 'black' hook","articleBody":"I have this config:\r\n\r\n```\r\npanman master $ cat .pre-commit-config.yaml\r\nrepos:\r\n-   repo: https://github.com/ambv/black\r\n    rev: stable\r\n    hooks:\r\n    - id: black\r\n      language_version: python3.6\r\n```\r\n\r\nAnd I've pip-installed the latest pre-commit 1.12.0 to the Python 3.7.1 environment, but when I run pre-commit, it fails thus:\r\n\r\n```\r\npanman master $ pre-commit run --all-files\r\nblack....................................................................Failed\r\nhookid: black\r\n\r\nTraceback (most recent call last):\r\n  File \"/Users/jaraco/.cache/pre-commit/repoogmwxpko/py_env-python3.6/bin/black\", line 7, in \u003cmodule\u003e\r\n    from black import main\r\n  File \"/Users/jaraco/.cache/pre-commit/repoogmwxpko/py_env-python3.6/lib/python3.6/site-packages/black.py\", line 41, in \u003cmodule\u003e\r\n    import toml\r\nModuleNotFoundError: No module named 'toml'\r\nTraceback (most recent call last):\r\n  File \"/Users/jaraco/.cache/pre-commit/repoogmwxpko/py_env-python3.6/bin/black\", line 7, in \u003cmodule\u003e\r\n    from black import main\r\n  File \"/Users/jaraco/.cache/pre-commit/repoogmwxpko/py_env-python3.6/lib/python3.6/site-packages/black.py\", line 41, in \u003cmodule\u003e\r\n    import toml\r\nModuleNotFoundError: No module named 'toml'\r\nTraceback (most recent call last):\r\n  File \"/Users/jaraco/.cache/pre-commit/repoogmwxpko/py_env-python3.6/bin/black\", line 7, in \u003cmodule\u003e\r\n    from black import main\r\n  File \"/Users/jaraco/.cache/pre-commit/repoogmwxpko/py_env-python3.6/lib/python3.6/site-packages/black.py\", line 41, in \u003cmodule\u003e\r\n    import toml\r\nModuleNotFoundError: No module named 'toml'\r\nTraceback (most recent call last):\r\n  File \"/Users/jaraco/.cache/pre-commit/repoogmwxpko/py_env-python3.6/bin/black\", line 7, in \u003cmodule\u003e\r\n    from black import main\r\n  File \"/Users/jaraco/.cache/pre-commit/repoogmwxpko/py_env-python3.6/lib/python3.6/site-packages/black.py\", line 41, in \u003cmodule\u003e\r\n    import toml\r\nModuleNotFoundError: No module named 'toml'\r\n```\r\n\r\nWhat am I doing wrong?","author":{"url":"https://github.com/jaraco","@type":"Person","name":"jaraco"},"datePublished":"2018-11-09T17:25:09.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/863/pre-commit/issues/863"}