Implement PEP 771

pyproject.toml

@@ -20,27 +20,36 @@ classifiers = [
     "Framework :: Matplotlib",
     "Programming Language :: Python :: 3",
 ]
+dynamic = ["version"]
 
 requires-python = ">=3.9"
 dependencies = [
     "matplotlib>=3.6",
     "numpy>=1.17.0",
     "scipy>=1.2.0",
 ]
-dynamic = ["version"]
 
-[project.urls]
-homepage = "https://github.com/eltos/xplt"
-documentation = "https://xsuite.github.io/xplt"
-repository = "https://github.com/xsuite/xplt"
+default-optional-dependency-keys = [
+    "recommended",
+]
 
 [project.optional-dependencies]
+minimal= []
+recommended = [
+    "pint>=0.24.1",
+]
 full = [
+    "xplt[recommended]",
     "pandas",
-    "pint>=0.24.1",
 ]
 
 
+[project.urls]
+homepage = "https://github.com/eltos/xplt"
+documentation = "https://xsuite.github.io/xplt"
+repository = "https://github.com/xsuite/xplt"
+
+
 # Build tools
 
 [build-system]