'Provides "Strip trailing whitespace" under the "Format" menu.' class RstripExtension: menudefs = [ ('format', [None, ('Strip trailing whitespace', '<>'), ] ), ] def __init__(self, editwin): self.editwin = editwin self.editwin.text.bind("<>", self.do_rstrip) def do_rstrip(self, event=None): text = self.editwin.text undo = self.editwin.undo undo.undo_block_start() end_line = int(float(text.index('end'))) for cur in range(1, end_line): txt = text.get('%i.0' % cur, '%i.end' % cur) raw = len(txt) cut = len(txt.rstrip()) # Since text.delete() marks file as changed, even if not, # only call it when needed to actually delete something. if cut < raw: text.delete('%i.%i' % (cur, cut), '%i.end' % cur) undo.undo_block_stop() if __name__ == "__main__": import unittest unittest.main('idlelib.idle_test.test_rstrip', verbosity=2, exit=False)