Drop walrus operators for Python 3.7 compatibility

Author: noirbizarre

tox_pdm/plugin3.py

@@ -28,7 +28,8 @@ def tox_addoption(parser: config.Parser) -> Any:
 
 @hookimpl
 def tox_configure(config: config.Config):
-    if scripts := pdm_scripts(config.toxinidir):
+    scripts = pdm_scripts(config.toxinidir)
+    if scripts:
         for cfg in config.envconfigs.values():
             cfg.allowlist_externals.append("pdm")
             for lineno, cmd in enumerate(cfg.commands):

tox_pdm/plugin4.py

@@ -72,7 +72,8 @@ def execute(
         run_id: str = "",
         executor: Execute | None = None,
     ) -> Outcome:
-        if scripts := pdm_scripts(self.core["tox_root"]):
+        scripts = pdm_scripts(self.core["tox_root"])
+        if scripts:
             if cmd[0] in scripts:
                 cmd = ["pdm", "run", *cmd]
         return super().execute(cmd, stdin, show, cwd, run_id, executor)

tox_pdm/utils.py

@@ -7,7 +7,8 @@
 
 
 def pdm_scripts(root: Path) -> dict[str, Any]:
-    if (pyproject_toml := root / "pyproject.toml").exists():
+    pyproject_toml = root / "pyproject.toml"
+    if pyproject_toml.exists():
         pyproject = toml.load(pyproject_toml.open("r"))
         return pyproject.get("tool", {}).get("pdm", {}).get("scripts", {})
     return {}