Add programmatic export API

[ObservedObserver]

Summary

• allow exporting to svg with export_chart_svg
• support saving charts as svg
• document the new API

Testing

• pytest -q (fails: command not found)

[cursor]

Bug: SVG Export Method Returns Incorrect Data Type

The export_chart_svg method is type-hinted to return bytes, but can return non-bytes data. If svg_str (from chart_data.charts[0].data) is neither a string nor bytes, it is returned directly, violating the type contract and causing runtime errors for callers expecting bytes. Additionally, the base64.b64decode call can raise an unhandled binascii.Error if the base64 data is malformed.

pygwalker/api/pygwalker.py#L317-L330

pygwalker/pygwalker/api/pygwalker.py

Lines 317 to 330 in 1c0d3b0

	def export_chart_svg(self, chart_name: str) -> bytes:
	"""Export the chart as svg bytes."""
	chart_data = self._get_chart_by_name(chart_name)
	if len(chart_data.charts) == 0:
	raise ValueError(f"chart_name: {chart_name} has no svg data")
	svg_str = chart_data.charts[0].data
	prefix = "data:image/svg+xml;base64,"
	if isinstance(svg_str, str) and svg_str.startswith(prefix):
	import base64
	return base64.b64decode(svg_str[len(prefix):])
	if isinstance(svg_str, str):
	return svg_str.encode("utf-8")
	return svg_str

Fix in Cursor

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