makes HeapEntrypoint a dataclass

Author: kaushikcfd

pytools/graph.py

@@ -191,6 +191,7 @@ def __init__(self, node):
         self.node = node
 
 
+@dataclass(frozen=True)
 class HeapEntry:
     """
     Helper class to compare associated keys while comparing the elements in
@@ -199,9 +200,8 @@ class HeapEntry:
     Only needs to define :func:`pytools.graph.__lt__` according to
     <https://github.com/python/cpython/blob/8d21aa21f2cbc6d50aab3f420bb23be1d081dac4/Lib/heapq.py#L135-L138>.
     """
-    def __init__(self, node, key):
-        self.node = node
-        self.key = key
+    node: Any
+    key: Any
 
     def __lt__(self, other):
         return self.key < other.key