human
Give me a the Python code you requested given the following:
Complete the below
@convert_to_seconds(['t1', 't2'])
@use_clip_fps_by_default
def manual_tracking(clip, t1=None, t2=None, fps=None, nobjects=1, savefile=None):

    ''''Allows manual tracking of an object(s) in the video clip between
    times `t1` and `t2`. This displays the clip frame by frame
    and you must click on the object(s) in each frame. If ``t2=None``
    only the frame at ``t1`` is taken into account.
    Returns a list [(t1,x1,y1),(t2,x2,y2) etc... ] if there is one
    object per frame, else returns a list whose elements are of the
    form (ti, [(xi1,yi1), (xi2,yi2), ...] )
    Parameters
    t1,t2:
    times during which to track (defaults are start and
    end of the clip). t1 and t2 can be expressed in seconds
    like 15.35, in (min, sec), in (hour, min, sec), or as a
    string: \'01:03:05.35\'.
    fps:
    Number of frames per second to freeze on. If None, the clip\'s
    fps attribute is used instead.
    nobjects:
    Number of objects to click on each frame.
    savefile:
    If provided, the result is saved to a file, which makes
    it easier to edit and re-use later.
    Examples
    >>> from moviepy.editor import VideoFileClip
    >>> from moviepy.video.tools.tracking import manual_tracking
    >>> clip = VideoFileClip("myvideo.mp4")
    >>> # manually indicate 3 trajectories, save them to a file
    >>> trajectories = manual_tracking(clip, t1=5, t2=7, fps=5,
    nobjects=3, savefile="track.txt")
    >>> # LATER, IN ANOTHER SCRIPT, RECOVER THESE TRAJECTORIES
    >>> from moviepy.video.tools.tracking import Trajectory
    >>> traj1, traj2, traj3 = Trajectory.load_list(\'track.txt\')
    >>> # If ever you only have one object being tracked, recover it with
    >>> traj, =  Trajectory.load_list(\'track.txt\')'
    '''
assistant
#Here is the Python code you requested.
    import pygame as pg
    screen = pg.display.set_mode(clip.size)
    step = (1.0 / fps)
    if ((t1 is None) and (t2 is None)):
        (t1, t2) = (0, clip.duration)
    elif (t2 is None):
        t2 = (t1 + (step / 2))
    t = t1
    txy_list = []
    def gatherClicks(t):
        imdisplay(clip.get_frame(t), screen)
        objects_to_click = nobjects
        clicks = []
        while objects_to_click:
            for event in pg.event.get():
                if (event.type == pg.KEYDOWN):
                    if (event.key == pg.K_BACKSLASH):
                        return 'return'
                    elif (event.key == pg.K_ESCAPE):
                        raise KeyboardInterrupt()
                elif (event.type == pg.MOUSEBUTTONDOWN):
                    (x, y) = pg.mouse.get_pos()
                    clicks.append((x, y))
                    objects_to_click -= 1
        return clicks
    while (t < t2):
        clicks = gatherClicks(t)
        if (clicks == 'return'):
            txy_list.pop()
            t -= step
        else:
            txy_list.append((t, clicks))
            t += step
    (tt, xylist) = zip(*txy_list)
    result = []
    for i in range(nobjects):
        xys = [e[i] for e in xylist]
        (xx, yy) = zip(*xys)
        result.append(Trajectory(tt, xx, yy))
    if (savefile is not None):
        Trajectory.save_list(result, savefile)
    return result