graph: avoid variable shadowing and typing warnings

graph.py

@@ -1,23 +1,21 @@
 #!/usr/bin/env python3
 
 import json
-import typing
 import os
 
+from typing import Dict
 
-def as_graphviz(recipes: dict):
+
+def graph_all(recipes: dict) -> None:
     print("digraph G {")
     for result, method in recipes.items():
         for variation in method:
-            for input in variation["input"]:
-                print(f"{input} -> {result}")
+            for i in variation["input"]:
+                print(f"{i} -> {result}")
     print("}")
 
 
-if __name__ == '__main__':
-    root = os.path.dirname(__file__)
-    recipe_root = os.path.join(root, 'data', 'recipes')
-
+def load_recipes(recipe_root: str) -> dict:
     recipes = dict()
 
     for dirname, dirs, files in os.walk(recipe_root):
@@ -29,4 +27,10 @@ if __name__ == '__main__':
 
             recipes[name] = variations
 
-    as_graphviz(recipes)
+    return recipes
+
+
+if __name__ == '__main__':
+    root = os.path.dirname(__file__)
+    recipe_root = os.path.join(root, 'data', 'recipes')
+    graph_all(load_recipes(recipe_root))