Dedupe packages (with set()) earlier to improve logging and very slightly improve speed.

tox_poetry_installer/hooks.py

@@ -193,7 +193,7 @@ def tox_testenv_install_deps(venv: ToxVirtualEnv, action: ToxAction) -> Optional
                 f"Identified {len(dev_deps)} development dependencies to install to env"
             )
         else:
-            dev_deps = []
+            dev_deps = set()
             logger.info("Env does not install development dependencies, skipping")
 
         env_deps = utilities.find_additional_deps(
@@ -220,7 +220,7 @@ def tox_testenv_install_deps(venv: ToxVirtualEnv, action: ToxAction) -> Optional
                 f"Identified {len(project_deps)} project dependencies to install to env"
             )
         else:
-            project_deps = []
+            project_deps = set()
             logger.info("Env does not install project package dependencies, skipping")
     except exceptions.ToxPoetryInstallerException as err:
         venv.status = err.__class__.__name__
@@ -231,7 +231,7 @@ def tox_testenv_install_deps(venv: ToxVirtualEnv, action: ToxAction) -> Optional
         logger.error(f"Internal plugin error: {err}")
         raise err
 
-    dependencies = dev_deps + env_deps + project_deps
+    dependencies = dev_deps | env_deps | project_deps
     if (
         venv.envconfig.config.option.parallel_install_threads
         != constants.DEFAULT_INSTALL_THREADS

tox_poetry_installer/installer.py

@@ -6,7 +6,7 @@ import concurrent.futures
 import contextlib
 import typing
 from datetime import datetime
-from typing import Sequence
+from typing import Collection
 from typing import Set
 
 from poetry.core.packages.package import Package as PoetryPackage
@@ -22,7 +22,7 @@ if typing.TYPE_CHECKING:
 def install(
     poetry: "_poetry.Poetry",
     venv: ToxVirtualEnv,
-    packages: Sequence[PoetryPackage],
+    packages: Collection[PoetryPackage],
     parallels: int = 0,
 ):
     """Install a bunch of packages to a virtualenv

tox_poetry_installer/utilities.py

@@ -182,7 +182,7 @@ def find_project_deps(
     venv: "_poetry.VirtualEnv",
     poetry: "_poetry.Poetry",
     extras: Sequence[str] = (),
-) -> List[PoetryPackage]:
+) -> Set[PoetryPackage]:
     """Find the root project dependencies
 
     Recursively identify the dependencies of the root project package
@@ -218,7 +218,7 @@ def find_project_deps(
             dep_name.lower(), packages, venv, allow_missing=[poetry.package.name]
         )
 
-    return dependencies
+    return set(dependencies)
 
 
 def find_additional_deps(
@@ -226,7 +226,7 @@ def find_additional_deps(
     venv: "_poetry.VirtualEnv",
     poetry: "_poetry.Poetry",
     dep_names: Sequence[str],
-) -> List[PoetryPackage]:
+) -> Set[PoetryPackage]:
     """Find additional dependencies
 
     Recursively identify the dependencies of an arbitrary list of package names
@@ -243,12 +243,12 @@ def find_additional_deps(
             dep_name.lower(), packages, venv, allow_missing=[poetry.package.name]
         )
 
-    return dependencies
+    return set(dependencies)
 
 
 def find_dev_deps(
     packages: PackageMap, venv: "_poetry.VirtualEnv", poetry: "_poetry.Poetry"
-) -> List[PoetryPackage]:
+) -> Set[PoetryPackage]:
     """Find the dev dependencies
 
     Recursively identify the Poetry dev dependencies
@@ -261,7 +261,11 @@ def find_dev_deps(
         packages,
         venv,
         poetry,
-        poetry.pyproject.data["tool"]["poetry"].get("group", {}).get("dev", {}).get("dependencies", {}).keys()
+        poetry.pyproject.data["tool"]["poetry"]
+        .get("group", {})
+        .get("dev", {})
+        .get("dependencies", {})
+        .keys(),
     )
 
     # Legacy pyproject.toml poetry format: