"This environment is externally managed" when library tries to install package during runtime

[samrat]

Hello, thanks for this library!

I'm trying to use a library which depends on spacy. This library seems to install a model as a Python package during runtime. And I get this error:

[notice] A new release of pip is available: 24.3.1 -> 25.0.1
[notice] To update, run: /Users/samrat/Library/Caches/pythonx/0.4.2/uv/0.5.21/python/cpython-3.12.8-macos-aarch64-none/bin/python -m pip install --upgrade pip
error: externally-managed-environment

× This environment is externally managed
╰─> This Python installation is managed by uv and should not be modified.

note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages.
hint: See PEP 668 for the detailed specification.

This is the script I ran:

Mix.install([
  {:pythonx, "~> 0.4.2"}
])

Pythonx.uv_init("""
[project]
name = "project"
version = "0.0.0"
requires-python = "==3.12.*"
dependencies = [
  "misaki[en]",
]
""")

Pythonx.eval(
  """
  import spacy
  spacy.cli.download("en_core_web_trf")
  """,
  %{}
)

The equivalent Python script(also run using uv) seems to run fine:

#!/usr/bin/env python3
# /// script
# dependencies = [
#   "pip",
#   "misaki[en]"
# ]
# ///

import spacy
# Download spaCy model if needed
try:
    spacy.load("en_core_web_trf")
except OSError:
    print("Downloading en_core_web_trf...")
    spacy.cli.download("en_core_web_trf")
    print("Installed en_core_web_trf")

Any ideas on how I could get around this?

[jonatanklosko]

Hey @samrat! Thanks for the report, it should now work on main (#14, #15).

Note that you need to add pip to the dependency list, as you did in the latter script :)