i3/sway mark, swap, unmark with a single command using i3ipc-python

swap-windows.py

#!/usr/bin/env python3
from i3ipc import Connection

mark = "swapTarget"
con = Connection()

try:
    # Swap marked target with focus, unmark
    swapTarget = con.get_tree().find_marked(mark)[0]
    con.command("swap container with mark %s" % mark)
    con.command("unmark %s" % mark)
except Exception:
    # Mark focus if none are marked
    con.command("mark %s" % mark)