tmux-clean-windows.py

#!/usr/bin/env python
from sh import tmux
curwin = tmux('display-message', p='#{window_index}').strip()
windows = [line.split()[0].strip(':') for line in tmux('list-windows')]
for src, dest in zip(windows, range(1, len(windows)+1)):
    if str(src) == str(curwin):
        curwin = dest
    if str(dest) != str(src):
        tmux('move-window', s=src, t=dest)
tmux('select-window', t=curwin)