pyqgis - Is it possible to show our custom message in QGIS Status bar using python?

Is there any way to show our custom message in Qgis Status bar using python? Just like in arcgis IApplication.statusbar.message(0) = "Please wait..."

like that is there any option to show progressbar in Qgis like IApplication.progressbar.show()

Answer

There is iface.mainWindow().statusBar() which returns a QStatusBar

iface.mainWindow().statusBar().showMessage( u"Hello World" )

Starting from QGIS 2.0 there is also QgsMessageBar which is able to display unobtrusive messages

iface.messageBar().pushInfo(u'My Plugin says', u'Hey there')

Advanced

The message bar can also show any QWidget (like a QProgressBar) with a close button and a timeout (5 seconds in the example).

from PyQt4.QtGui import QProgressBar
from qgis.gui import QgsMessageBar
msgBar = iface.messageBar()


pb = QProgressBar( msgBar )
msgBar.pushWidget( pb, QgsMessageBar.INFO, 5 )

msg = msgBar.createMessage( u'Hello World' )
msgBar.pushWidget( msg, QgsMessageBar.WARNING, 5 )

More info about QgsMessageBar can be found in this answer by NathanW How to address the new "Task-Completed" QgsMessageBar in Python? Thanks for pointing out Curlew

Legacy

In the python console for QGIS < 1.9 it would be:

qgis.utils.iface.mainWindow().statusBar().showMessage( u"Hello World" )