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Speed up SCC dependency inference #18299

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Dec 16, 2024
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Speed up SCC dependency inference #18299

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6 changes: 5 additions & 1 deletion mypy/graph_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,11 @@ def prepare_sccs(
sccs: list[set[T]], edges: dict[T, list[T]]
) -> dict[AbstractSet[T], set[AbstractSet[T]]]:
"""Use original edges to organize SCCs in a graph by dependencies between them."""
sccsmap = {v: frozenset(scc) for scc in sccs for v in scc}
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If you wanted to keep the dict comprehension, you could use an assignment expression

sccsmap = {v: s for scc in sccs if (s := frozenset(scc)) is not None for v in scc}  # type: ignore[redundant-expr]

It adds an additional if not None check for each scc that's always true but necessary to use :=.

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Good point, but I think this version is clearer

sccsmap = {}
for scc in sccs:
scc_frozen = frozenset(scc)
for v in scc:
sccsmap[v] = scc_frozen
data: dict[AbstractSet[T], set[AbstractSet[T]]] = {}
for scc in sccs:
deps: set[AbstractSet[T]] = set()
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