有一些策略你可以尝试：
1.如果该点位于图的右半部分，则使用负偏移放置注解：

for label, x, y in zip(bagOlabels, time, height):
    offset = (50, 20)
    if x > mid_x:
       offset = (-50, 20)  # (-50, -20) could be better

ax.annotate(...)

1.放大图，使所有注解都适合该图。
在第一种情况下，注解可能彼此重叠。

更新：

方法get_xlim返回图在x轴上的极限：

x = range(0, 100)
y = map(lambda x: x*x, x)

fig = pyplot.figure()
ax1 = fig.add_subplot(1, 1, 1)
ax1.plot(x, y, 'r.', x, y, 'r-')
xlim = ax1.get_xlim()

我找到了一种方法，虽然很粗糙，它包括首先在正常位置绘制注解，重新绘制画布，然后如果它在轴边界之外，则删除它并绘制一个新的注解。
我不知道如何更新原始注解的位置。这需要与this question相同的答案。
需要画布重绘fig.canvas.draw()来强制注解更新它的bbox，因此它可以与轴边界进行比较。我还没有找到一种方法来更新bbox而不进行完整的画布重绘。（这需要在代码中进行更多的挖掘）
画布重绘并在新位置重新创建注解会导致交互式图形上出现可见的 Flink ，但在保存到文件时应该可以正常工作，其中只有最终位置可见。
示例伪代码：（从工作代码复制的关键部分）

pos_dc = (X_DC, Y_DC) # position where the arrow is pointing, in data coordinates

xytext = [20, 20] # normal x and y position of the annotation textbox, in points coordines
xytext_flip = [-80, -80] # flipped x and y positions, when it's too close to edge, in points coordines
TEXT = ("Text box contents" + "\n" +
        "with multiple" + "\n" +
        "lines"
        )

# create original annotation to measure its position
annot = ax.annotate ("", xy=(0,0), xytext=(xytext[0],xytext[1]),
            textcoords="offset points", bbox=dict(boxstyle="round",
            fc="w"), arrowprops=dict(arrowstyle="->", color='black')
        )
annot.xy = pos_dc
annot.set_text (TEXT)

# draw the canvas, forcing the annotation position to be updated
# fig.canvas.draw_idle() didn't work here
fig.canvas.draw()

# measure the annotation's position
p = annot.get_bbox_patch()
ex = p.get_extents() # annotation textbox, in pixel coordinates
T = ax.transData.inverted()
ex_datac = T.transform (ex) # annotation textbox, in data coordinates

# ex_datac structure in data coordinates:
# [[xleft  ybottom] [xright  ytop]]

ax_xb = ax.get_xbound()
ax_yb = ax.get_ybound() # axis bounds (the visible area), in data coordinates

# structure in data coordinates:
# ax_xb = (xleft, xright) , ax_yb = (ybottom, ytop)

# in data coordinates, (y) top is a GREATER value than bottom, use '>' to compare it
dc_top_of_display = ax_yb[1]
dc_bottom_of_display = ax_yb[0]
dc_left_of_display = ax_xb[0]
dc_right_of_display = ax_xb[1]

# only testing the right and top edges of the annotation textbox, which was sufficient in this case
dc_box_right = ex_datac[1][0]
dc_box_top = ex_datac[1][1]

# test whether the annotation textbox is outside of the axis bounds
flip_x = dc_box_right > dc_right_of_display
flip_y = dc_box_top > dc_top_of_display # top is GREATER than bottom, use '>'

# if the text box right or top edges are outside of the axis bounds, update the annotation's position
if flip_x or flip_y:
    xytext2 = [0, 0]
    xytext2[0] = xytext[0] if not flip_x else xytext_flip[0]
    xytext2[1] = xytext[1] if not flip_y else xytext_flip[1]

    # remove the original annotation
    annot.remove ()

    # create new annotation with updated position
    annot = ax.annotate ("", xy=(0,0), xytext=(xytext2[0],xytext2[1]),
                textcoords="offset points", bbox=dict(boxstyle="round",
                fc="w"), arrowprops=dict(arrowstyle="->", color='black')
            )
    annot.xy = pos_dc
    annot.set_text (TEXT)

    # redraw the canvas
    fig.canvas.draw_idle()