[Python] Show the marker and the line at the same time at the legend of boxplot

I want to show marker without the line, mean, median line in the legend. I don't know how to remove the line in the marker

I try to add the handlelength=0. in the legend, but it will remove all the line in the legend.

#draw boxplot
medianprops = dict(linestyle='dashdot', linewidth=1, color='darkgoldenrod')
meanprops = dict(linestyle=(0,(3, 1, 1, 1)), linewidth=1, color='fuchsia')
# extract the characteristic in the boxplot
B = ax[1].boxplot(data, vert=0, showfliers=False, medianprops=medianprops, showmeans=True, meanline=True, meanprops=meanprops)
lower_bound, upper_bound = [item.get_xdata()[1] for item in B['whiskers']]
boxes = [item.get_xdata() for item in B['boxes']][0]

# cal the condition of outlier
q1 = np.percentile(data, 25)
q3 = np.percentile(data, 75)
iqr = q3 - q1
upper_box = boxes[2]
mild_c = 1.5 * iqr + upper_box
extr_c = 3.0 * iqr + upper_box
# catagorize outlier
mild_outlier = data[data >= mild_c]
mild_outlier = mild_outlier[mild_outlier < extr_c]
extreme_outlier = data[data >= extr_c]
# draw the figure
ax[1].set_xlabel('Fuel Efficiency (mpg)')
ax[1].set_title('boxplot of Fuel Efficincies(mpg)')
marker1 = ax[1].plot(mild_outlier, np.ones_like(mild_outlier), marker='+', color='blue', linestyle = None)
marker2 = ax[1].plot(extreme_outlier, np.ones_like(extreme_outlier), marker='+', color='red')
print(B)
# draw label
ax[1].legend([B["medians"][0], B["means"][0], marker1[0]], ['median', 'mean', 'marker'], loc='upper right')

plt.show()


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