import nuke


def toggleZip1():
	nodes = nuke.selectedNodes()
	for f in nodes:
		path = f['file'].value()
		if path.find('zip1') == -1:
			newpath = path[:-13] + '_zip1' + path[-13:]
			f['file'].setValue(newpath)
		elif path.find('zip1') != -1:
			newpath = path.replace('_zip1', '')
			f['file'].setValue(newpath)