We can use iface.showAttributeTable() function for opening attribute table of a vector layer:
<pre><code>uri = "D:/Python_QGIS/data/Countries.shp"
vlayer = QgsVectorLayer(uri, "Countries", "ogr")

iface.showAttributeTable(vlayer)
</code></pre>

We can use *iface.showAttributeTable()* function for opening attribute table of a vector layer:

```
uri = "D:/Python_QGIS/data/Countries.shp"
vlayer = QgsVectorLayer(uri, "Countries", "ogr")

iface.showAttributeTable(vlayer)
``` 

7- Show attribute table of a vector layer

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