Actions are integrated into the QGIS GUI andĪllow you to execute PyQGIS code on vector layers.Īctions are defined at the layer level. Or an attribute value in the attribute table.Īctions provide an easy way to add custom behavior to QGIS without Response to a user’s action - such as click on a feature in the canvas In QGIS provide a quick and easy way to trigger custom behavior in For pyqgis scripts elsewhere, we have to explicitly import the Import any modules since they are done automatically when the console
We ran the code snippets in the Python Console, we did not have to Note the imports at the top - including iface. Iface.initializationCompleted signal when the main windowĬreate a new file named startup.py with the followingĬode. We can read that variable and set the main The version name is stored in a global QGIS variable called If you are running multiple versions of QGIS, a very usefulĬustomization is to display the QGIS version number and name in the main Useful in customizing QGIS interface with techniques learnt in the Home directory, and if it is found, executes it. QGIS looks for a file named startup.py in the user’s Python It is possible to execute some PyQGIS code every time QGIS starts. _init_(color, type, seats) self.range_km = range_km my_car = Sedan( 'blue', 'automatic', 5) print(my_car.color) print(my_car.seats) my_car.start() my_future_car = ElectricSedan( 'red', 'automatic', 5, 500) print(my_future_car.color) print(my_future_car.seats) print(my_future_car.range_km) my_future_car.start() _init_(color, type) ats = seats class ElectricSedan(Sedan): def _init_( self, color, type, seats, range_km): super(). type = type self.started = False self.stopped = False def start( self): print( 'Car Started') self.started = True self.stopped = False def stop( self): print( 'Car Stopped') self.stopped = True sefl.started = False # Instantiate the class my_car = Car( 'blue', 'automatic') print(my_car) # Call a method my_car.start() # Check the value of an instance variable print( 'Car Started?', my_car.started) # Check the value of a class variable print( 'Car model', Car.model) # Inheritance class Sedan(Car): def _init_( self, color, type, seats): super(). Power of the PyQGIS API, we must first understand how classes work.Ĭlass Car: model = 'Civic' def _init_( self, color, type): lor = color self. This gives you a preview of the power of the API. mitChanges(): This method saves the editīuffer and also disables the editing mode.Here we pass on index 1 for the secondĪttribute.
layer.startEditing(): This is equivalent to putting the.The method returns the reference to the layer which is saved in the We will learn moreĪbout iface in the QGIS Interface API section. Which returns the currently selected layer in QGIS. Iface object and runs the activeLayer() method layer = iface.activeLayer(): This line uses the.You will see that the 2nd column is now deleted from the attribute Layer = iface.activeLayer() layer.startEditing() leteAttribute( 1) mitChanges() Make sure you have selected the shoreline layer in the Open theĮditor and enter the following code. Will now do this task - but using only Python code. QGIS Provides an API to accomplish all of this using Python code.
Click the Save edits button and click the Toggle.In the Attribute Table, click the Toggle Editing mode.Right-click the shoreline layer and click Open.This can be done using the QGIS GUI as follows Let’s say we want to delete the 2nd column Let’s try out the API to perform some GIS data management tasks.īrowse to the data directory and load the shoreline.shp ThisĪllows developers to write code to build new tools, customize the Operation that you can do using QGIS - can be done using the API. QGIS provides a Python API (Application Programming Interface),Ĭommonly known as PyQGIS.
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