The Xonsh Python Shell(xon.sh)

    ls -fr \
    | select (f: f.suffix in ('.c', '.h')) \
    | map (f: f.read().count('\n')) \
    | red +

    from pathlib import Path
    from xonsh.events import events
    class CwdPath(type(Path())):
        def __iter__(self):
            return self.iterdir()

    $cwd = CwdPath.cwd()

    @events.on_chdir
    def set_cwd(olddir, newdir, **kw):
        $cwd = CwdPath(newdir)

    for f in $cwd:
        echo @(f.name)

    for f in $cwd.glob("**/*.png"):
        #Do a thing