changelog entry

Author: davidhewitt

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 ### Changed
  - Use the base interpreter path when running inside a virtual environment to avoid recompilation when switching between virtual environments. [#429](https://github.com/PyO3/setuptools-rust/pull/429)
+ - Delay import of dependencies until use to avoid import errors during a partially complete install when multiple packages are installing at once. [#437](https://github.com/PyO3/setuptools-rust/pull/437)
 
 ## 1.9.0 (2024-02-24)
 ### Changed

setuptools_rust/extension.py

@@ -190,6 +190,7 @@ def get_rust_version(self) -> Optional[SimpleSpec]:  # type: ignore[no-any-unimp
             return None
         try:
             from semantic_version import SimpleSpec
+
             return SimpleSpec(self.rust_version)
         except ValueError:
             raise SetupError(

setuptools_rust/rustc_info.py

@@ -14,6 +14,7 @@ def get_rust_version() -> Optional[Version]:  # type: ignore[no-any-unimported]
         # first line of rustc -Vv is something like
         # rustc 1.61.0 (fe5b13d68 2022-05-18)
         from semantic_version import Version
+
         return Version(_rust_version().split(" ")[1])
     except (subprocess.CalledProcessError, OSError):
         return None