Is there a way to specify that you don't care about pypy when creating a lockfile?

[wlach]

Consider this pyproject.toml:

[project]
name = "test-clickhouse-driver"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.11"
dependencies = [
    "databricks-sql-connector==3.6.0",
    "clickhouse-driver[lz4]==0.2.9",
]

These dependencies are mutually compatible using regular cpython, but not with pypy because clickhouse-driver[lz4] specifies that you need an older version of lz4 (that's incompatible with databricks-sql-connector) on that platform:

https://github.com/mymarilyn/clickhouse-driver/blob/8a4e7c5b99b532df2b015651d893a6f36288a22c/setup.py#L131

Thus running uv sync fails:

❯ uv sync
Using CPython 3.11.9 interpreter at: /Users/wlach/.local/share/mise/installs/python/3.11/bin/python3.11
Creating virtual environment at: .venv
  × No solution found when resolving dependencies for split
  │ (implementation_name == 'pypy'):
  ╰─▶ Because only the following versions of lz4{implementation_name ==
      'pypy'} are available:
          lz4{implementation_name == 'pypy'}==0.1
          lz4{implementation_name == 'pypy'}==0.2
          ...
          lz4{implementation_name == 'pypy'}>=3.0.1
      and databricks-sql-connector==3.6.0 depends on lz4>=4.0.2,
      we can conclude that databricks-sql-connector==3.6.0 and
      lz4{implementation_name == 'pypy'}<=3.0.1 are incompatible.
      And because clickhouse-driver[lz4]==0.2.9 depends on
      lz4{implementation_name == 'pypy'}<=3.0.1, we can conclude that
      databricks-sql-connector==3.6.0 and clickhouse-driver[lz4]==0.2.9 are
      incompatible.
      And because your project depends on clickhouse-driver[lz4]==0.2.9 and
      databricks-sql-connector==3.6.0, we can conclude that your project's
      requirements are unsatisfiable.

Locally we can workaround this by adding ;implementation_name != 'pypy' to the clickhouse driver specification:

[project]
name = "test-clickhouse-driver"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.11"
dependencies = [
    "databricks-sql-connector==3.6.0",
    "clickhouse-driver[lz4]==0.2.9;implementation_name != 'pypy'",
]

However that doesn't help if one of your dependencies is also depending on the generic clickhouse-driver[lz4]. Is there any way I can say that I just don't care about pypy when creating a uv lockfile? I know they're supposed to be cross-platform/implementation but for our use cases at least we don't really need this guarantee.

[zanieb]

Does a limited resolution environment work for you?

I think it'd be

[tool.uv]
environments = [
    "implementation_name != 'pypy'"
]

[zanieb]

You can also use dependency overrides to override a transitive dependency

[wlach]

Does a limited resolution environment work for you?

I think it'd be

[tool.uv]
environments = [
"implementation_name != 'pypy'"
]

Yes! That was exactly what I was looking for. Might make sense to mention pypy there as well?