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Some of the QGIS tools can be selected/activated via PyQGIS using the iface object (see QgisInterface). For example: 

iface.actionIdentify().trigger() # Activates the Identify tool

However, the Text Annotation tool (and also HTML, SVG, and Form annotation tools) are not available in iface.

How can I select/activate the Text Annotation tool from my QGIS python plugin?

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    – underdark
    Commented Dec 8, 2016 at 16:42

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Since there's no direct method to select the QGIS Text Annotation tool from the iface object, you can do it in this way:

For QGIS 2.x

from PyQt4.QtGui import QAction
iface.mainWindow().findChild( QAction, 'mActionTextAnnotation' ).trigger()

Updated for QGIS 3.x

from qgis.PyQt.QtWidgets import QAction

iface.mainWindow().findChild( QAction, 'mActionHtmlAnnotation' ).trigger()

You can use the others related actions e.g mActionFormAnnotation, mActionHtmlAnnotation, mActionSvgAnnotation instead of mActionTextAnnotation

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    It worked!, that worked perfectly.
    – Mai
    Commented Dec 25, 2016 at 9:13

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