ROOT.TColor.DefinedColors(1) problematic in jupyter notebooks #20018
Description
Check duplicate issues.
- Checked for duplicates
Description
The following code runs fine as a script but throws an error in jupyter notebook. The issue is seemingly caused by the first line ROOT.TColor.DefinedColors(1). Thanks to @oglez for tracking it down.
Reproducer
import ROOT
# Create a canvas
ROOT.TColor.DefinedColors(1)
c = ROOT.TCanvas("c", "Basic ROOT Plot", 800, 600)
# Create a histogram with 100 bins from 0 to 10
h = ROOT.TH1F("h", "Example Histogram;X axis;Entries", 100, 0, 10)
# Fill histogram with random Gaussian numbers
for _ in range(10000):
h.Fill(ROOT.gRandom.Gaus(5, 1))
# Draw the histogram
h.Draw()
# Show canvas inline in Jupyter
c.Draw()
ROOT version
6.34 (also .32 and .36) as reportedly
Installation method
conda
Operating system
Windows (WSL)
Additional context
Trace
---------------------------------------------------------------------------
SegmentationViolation Traceback (most recent call last)
File ~/software/miniforge3/envs/def/lib/python3.12/site-packages/JupyROOT/helpers/utils.py:471, in CaptureDrawnPrimitives._post_execute(self)
470 def _post_execute(self):
--> 471 NotebookDraw()
File ~/software/miniforge3/envs/def/lib/python3.12/site-packages/JupyROOT/helpers/utils.py:460, in NotebookDraw()
458 def NotebookDraw():
459 DrawGeometry()
--> 460 DrawCanvases()
461 DrawRCanvases()
File ~/software/miniforge3/envs/def/lib/python3.12/site-packages/JupyROOT/helpers/utils.py:451, in DrawCanvases()
449 drawers = GetCanvasDrawers()
450 for drawer in drawers:
--> 451 drawer.Draw()
File ~/software/miniforge3/envs/def/lib/python3.12/site-packages/JupyROOT/helpers/utils.py:647, in NotebookDrawer.Draw(self)
646 def Draw(self):
--> 647 self._display()
648 return 0
File ~/software/miniforge3/envs/def/lib/python3.12/site-packages/JupyROOT/helpers/utils.py:633, in NotebookDrawer._display(self)
631 else:
632 if self._canJsDisplay():
--> 633 self._jsDisplay()
634 else:
635 self._pngDisplay()
File ~/software/miniforge3/envs/def/lib/python3.12/site-packages/JupyROOT/helpers/utils.py:597, in NotebookDrawer._jsDisplay(self)
595 name = self._getDrawId()
596 updated = self._getUpdated()
--> 597 jsdiv = self._getJsDiv()
598 if name and (name in _canvasHandles) and updated:
599 _canvasHandles[name].update(jsdiv)
File ~/software/miniforge3/envs/def/lib/python3.12/site-packages/JupyROOT/helpers/utils.py:576, in NotebookDrawer._getJsDiv(self)
575 def _getJsDiv(self):
--> 576 return display.HTML(self._getJsCode())
File ~/software/miniforge3/envs/def/lib/python3.12/site-packages/JupyROOT/helpers/utils.py:550, in NotebookDrawer._getJsCode(self)
548 json = self.drawableObject.CreateJSON()
549 else:
--> 550 json = produceCanvasJson(self.drawableObject).Data()
552 divId = self._getUniqueDivId()
554 width = _jsCanvasWidth
File ~/software/miniforge3/envs/def/lib/python3.12/site-packages/JupyROOT/helpers/utils.py:302, in produceCanvasJson(canvas)
299 canvas.Draw()
301 if TWebCanvasAvailable():
--> 302 return ROOT.TWebCanvas.CreateCanvasJSON(canvas, 23, True)
304 # Add extra primitives to canvas with custom colors, palette, gStyle
306 prim = canvas.GetListOfPrimitives()
SegmentationViolation: static TString TWebCanvas::CreateCanvasJSON(TCanvas* c, Int_t json_compression = 0, Bool_t batchmode = kFALSE) =>
SegmentationViolation: segfault in C++; program state was reset