Improve the PackageLoader error message

LilyFirefly · davidism · commit f54fa113d382 · 2024-12-19T20:02:32.000-08:00
This exception is raised when the `package_path` directory (default "templates") is not
found, so explain this.
diff --git a/src/jinja2/loaders.py b/src/jinja2/loaders.py
@@ -353,8 +353,8 @@ def __init__(
 
         if template_root is None:
             raise ValueError(
-                f"The {package_name!r} package was not installed in a"
-                " way that PackageLoader understands."
+                f"PackageLoader could not find a '{package_path}' directory for the "
+                f"{package_name!r} package."
             )
 
         self._template_root = template_root

Original file line number	Diff line number	Diff line change
`@@ -353,8 +353,8 @@ def __init__(`
`353`	`353`
`354`	`354`	`if template_root is None:`
`355`	`355`	`raise ValueError(`
`356`		`- f"The {package_name!r} package was not installed in a"`
`357`		`- " way that PackageLoader understands."`
	`356`	`+ f"PackageLoader could not find a '{package_path}' directory for the "`
	`357`	`+ f"{package_name!r} package."`
`358`	`358`	`)`
`359`	`359`
`360`	`360`	`self._template_root = template_root`