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"symbols()" is no longer available in QGIS 3.0 and replaced by "QgsRenderContext& context" method, but I do not find the correct way to write this instruction.

from PyQt5.QtGui import *

lyr=iface.activeLayer()
symbols = lyr.renderer().symbols()
sym = symbols[0]
sym.setColor(QColor.fromRgb(255,0,0))

lyr.triggerRepaint()
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1 Answer 1

Reset to default
6

You need to change

symbols=lyr.renderer().symbols()

to

symbols = lyr.renderer().symbols(QgsRenderContext())

and everything will work fine.

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2
  • Thank you for your quick response. However, “symbols()” is no longer available in qgis3.0 and replaced by “QgsRenderContext& context” method, but I do not find the correct way to write this instruction. from PyQt5.QtGui import * lyr=iface.activeLayer() symbols = lyr.renderer().symbols() sym = symbols[0] sym.setColor(QColor.fromRgb(255,0,0)) lyr.triggerRepaint()
    – ennine
    Commented May 17, 2018 at 13:21
  • 1
    @ennine I have edited my answer. Hope this answers your edited question.
    – Asad Abbas
    Commented May 17, 2018 at 14:08

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