black is not found when nbdev_export is run in pre-commit hook

[ulupo]

When creating a brand new repository and setting black_formatting=True in settings.ini, indeed black is run as part of nbdev_export correctly. However, when I add nbdev_clean and nbdev_export as pre-commit hooks, exactly as in the docs, nbdev_clean runs correctly but nbdev_export breaks with the following traceback:

Traceback (most recent call last):
  File "/Users/ulupo/.cache/pre-commit/repochwlih_v/py_env-python3.10/lib/python3.10/site-packages/nbdev/export.py", line 36, in black_format
    try: import black
ModuleNotFoundError: No module named 'black'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/ulupo/.cache/pre-commit/repochwlih_v/py_env-python3.10/bin/nbdev_export", line 8, in <module>
    sys.exit(nbdev_export())
  File "/Users/ulupo/.cache/pre-commit/repochwlih_v/py_env-python3.10/lib/python3.10/site-packages/fastcore/script.py", line 119, in _f
    return tfunc(**merge(args, args_from_prog(func, xtra)))
  File "/Users/ulupo/.cache/pre-commit/repochwlih_v/py_env-python3.10/lib/python3.10/site-packages/nbdev/doclinks.py", line 138, in nbdev_export
    for f in files: nb_export(f)
  File "/Users/ulupo/.cache/pre-commit/repochwlih_v/py_env-python3.10/lib/python3.10/site-packages/nbdev/export.py", line 49, in nb_export
    nb.process()
  File "/Users/ulupo/.cache/pre-commit/repochwlih_v/py_env-python3.10/lib/python3.10/site-packages/nbdev/process.py", line 126, in process
    for proc in self.procs: self._proc(proc)
  File "/Users/ulupo/.cache/pre-commit/repochwlih_v/py_env-python3.10/lib/python3.10/site-packages/nbdev/process.py", line 119, in _proc
    for cell in self.nb.cells: self._process_cell(proc, cell)
  File "/Users/ulupo/.cache/pre-commit/repochwlih_v/py_env-python3.10/lib/python3.10/site-packages/nbdev/process.py", line 110, in _process_cell
    if callable(proc) and not _is_direc(proc): cell = opt_set(cell, proc(cell))
  File "/Users/ulupo/.cache/pre-commit/repochwlih_v/py_env-python3.10/lib/python3.10/site-packages/nbdev/export.py", line 37, in black_format
    except: raise ImportError("You must install black: `pip install black` if you wish to use black formatting with nbdev")
ImportError: You must install black: `pip install black` if you wish to use black formatting with nbdev

I can make things work by activating the environment /Users/ulupo/.cache/pre-commit/repochwlih_v/py_env-python3.10 and installing black there, but this is not an ideal solution.