Download the <a target="_blank" href="https://github.com/Azad77/Python_qgis/blob/main/Data/KRG_Cities.zip">data</a> 
Then, load the point type shapefile
<pre><code>uri = "D:/Python_QGIS/data/KRG_Cities.shp"
vlayer = iface.addVectorLayer(uri, "KRG_Cities", "ogr")
</code></pre>Change the size of the circle
<pre><code>vlayer.renderer().symbol().setSize(8)
vlayer.triggerRepaint()
</code></pre>Change the color of the symbol
<pre><code>vlayer.renderer().symbol().setColor(QColor("green"))
vlayer.triggerRepaint()
</code></pre>Change circles to other symbols
<pre><code>vlayer.renderer().symbol().symbolLayer(0).setShape(QgsSimpleMarkerSymbolLayerBase.Pentagon)
vlayer.triggerRepaint()
</code></pre>

Download the [data](https://github.com/Azad77/Python_qgis/blob/main/Data/KRG_Cities.zip) 
Then, load the point type shapefile
```
uri = "D:/Python_QGIS/data/KRG_Cities.shp"
vlayer = iface.addVectorLayer(uri, "KRG_Cities", "ogr")```

Change the size of the circle
```
vlayer.renderer().symbol().setSize(8)
vlayer.triggerRepaint()```

Change the color of the symbol
```
vlayer.renderer().symbol().setColor(QColor("green"))
vlayer.triggerRepaint()```

Change circles to other symbols
```
vlayer.renderer().symbol().symbolLayer(0).setShape(QgsSimpleMarkerSymbolLayerBase.Pentagon)
vlayer.triggerRepaint()
```

10- Appearance of Vector Layers

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