Matplot dynamic drawing, how to clear only the redrawn legend?

-sharp!/usr/bin/env python
-sharp -*- coding: utf-8 -*-
-sharp @Time    : 18/2/26 12:52
-sharp @Author  : AlexZ33
-sharp @File    :
-sharp @Desc    :

import numpy as np
import matplotlib
import matplotlib.pyplot as plt
import matplotlib.font_manager as fm
from mpl_toolkits.mplot3d import Axes3D


-sharp 
myfont = fm.FontProperties(fname="/home/zk/study/python_lessions/DataVisualiztion/Library/Fonts/simsun.ttc", size=14)
matplotlib.rcParams["axes.unicode_minus"] = False

def simple_plot():
    """
    simple plot
    :return:
    """
    -sharp
    plt.figure(figsize=(8,6), dpi=80)

    -sharp
    plt.ion()

    -sharp 
    for index in range(100):
        -sharp
        plt.cla()
        -sharp
        plt.title("",fontproperties=myfont)
        plt.grid(True)

        -sharp
        x = np.linspace(-np.pi + index, np.pi+0.1*index, 256,endpoint=True)

        y_cos, y_sin = np.cos(x),np.sin(x)

        -sharp 
        plt.xlabel("x", fontproperties= myfont)
        plt.xlim(-4 + 0.1*index,4 + 0.1*index)
        plt.xticks(np.linspace(-4 + 0.1 * index, 4 + 0.1 * index, 9, endpoint=True))
        -sharp Y
        plt.ylabel("Y", fontproperties=myfont)
        plt.ylim(-1.0, 1.0)
        plt.yticks(np.linspace(-1, 1, 9, endpoint=True))

        -sharp 
        plt.plot(x, y_cos, "b--", linewidth=2.0, label="cos")
        plt.plot(x, y_sin, "g-", linewidth=2.0, label="sin")


        -sharp ,loc[upper, lower, left, right, center]
        plt.legend(loc="upper left", prop=myfont, shadow=True)

        -sharp 
        plt.pause(0.1)

    -sharp 
    plt.ioff()

    -sharp 
    plt.show()
    return


if __name__ == "__main__":
    simple_plot()



plt.cla () clears the previously drawn lines

plt.cla()

before drawing.

how to clear the legend without affecting cos, sin dynamic drawing

Mar.04,2021

Please try the following method.
Please replace the following statement:
plt.cla ()
with:
plt.clf ()

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