Hi I have written a script in PyROOT through my python interpreter (PyCharm) which takes data from a TTree and creates a TGraph. The script runs smoothly however I no visualization of the graph appears, does anyone else have this issue? I have tried with another script found on the ROOT guides as well which results in the same issue. The script I found and have used for an example to get a better understanding og TGraphs through python is:

```
from __future__ import print_function
import ROOT
from math import sin
from array import array
c1 = ROOT.TCanvas( 'c1', 'A Simple Graph Example', 200, 10, 700, 500 )
c1.SetFillColor( 42 )
c1.SetGrid()
n = 20
x, y = array( 'd' ), array( 'd' )
for i in range( n ):
x.append( 0.1*i )
y.append( 10*sin( x[i]+0.2 ) )
print(' i %i %f %f ' % (i,x[i],y[i]))
gr = ROOT.TGraph( n, x, y )
gr.SetLineColor( 2 )
gr.SetLineWidth( 4 )
gr.SetMarkerColor( 4 )
gr.SetMarkerStyle( 21 )
gr.SetTitle( 'a simple graph' )
gr.GetXaxis().SetTitle( 'X title' )
gr.GetYaxis().SetTitle( 'Y title' )
gr.Draw( 'ACP' )
# TCanvas.Update() draws the frame, after which one can change it
c1.Update()
c1.GetFrame().SetFillColor( 21 )
c1.GetFrame().SetBorderSize( 12 )
c1.Modified()
c1.Update()
```

Does anyone know why I don’t get a visualization of my graph when running this code?

Thank you for all help!