#1831 — `graphify export graphml` crashed on any dict/list-valued
attribute (per-node metadata dict, graph-level hyperedges list) because
nx.write_graphml only accepts scalars; a real ~2,300-node graph failed
every export and left a 0-byte .graphml behind. to_graphml now coerces
None->"" and JSON-serializes non-scalars across graph/node/edge scopes
(int/float/bool/str pass through), and writes atomically via a temp file
so a failed export can't leave a partial file. Closes#1830.
#1807 followup — adopt @varuntej07's explicit in-guard sys.stdout.flush()
from #1811: piped stdout is block-buffered, so a small fully-buffered
output would only flush at interpreter shutdown (outside the guard),
where a closed-pipe reader escapes as a noisy shutdown error and nonzero
exit. Flushing inside the try closes that gap. Closes#1811.
Reported by @hofmockel (#1831) and @varuntej07 (#1807/#1811).
Co-Authored-By: hofmockel <hofmockel@users.noreply.github.com>
Co-Authored-By: varuntej07 <varuntej07@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
