Example code: layer.setSubsetString(“‘4′ LIKE “dist_code””’)

# Show every province features (postcodes) one by one

from time import sleep

def stopped(task):
    pass
def completed(exception, result=None):
    pass
def run(task, wait_time):

    # main code
    postcodes = QgsProject.instance().mapLayersByName('postcodes')[0]
    wait_time = wait_time / 100
    prov = [1, 3, 4, 5, 6]
    for i, m in enumerate(prov):
        task.setProgress(i)
        sleep(wait_time)
        postcodes.setSubsetString("'" + str(m) + "'" + ''' LIKE "dist_code"''')

        if task.isCanceled():
            stopped(task)
            return None
    postcodes.setSubsetString("")

task = QgsTask.fromFunction(u'Task', run,
                            on_finished=completed, wait_time=150)
QgsApplication.taskManager().addTask(task)

Or by right click on layer and go to Source and Query Builder:


Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Please wait...

SUBSCRIBE TO CYPRUS DAMS MEASUREMENTS NEWS

Want to be notified when our Cyprus Dams article updated? Enter your email address and name below to be the first to know.
%d bloggers like this: