how to use pyplot.arrow or patches.Arrow in matplotlib?
If I wanted to draw arrows instead of axis lines using one of the arrow/Arrow functions, how do I get the line/arrowhead to show up? Example below:

    import matplotlib.pyplot as plt
    import matplotlib.patches as pts
    
    plt.ion()
    ax = plt.axes()
    ax.set(xlim=[0,1],ylim=[0,1],autoscale_on=False,clip_on=False)
    ax.set(frame_on=False,xticks=[],yticks=[])
    pts.Arrow(0,0,1,0,width=0.05)
    plt.arrow(0,0,0,1,shape='right',lw=3,fill=True)
    ax.text(1,0,'functionalization',
            verticalalignment='top',
            horizontalalignment='center')
    ax.text(0,1,'void space/structure')
    plt.draw()

pts.Arrow draws nothing, and plt.arrow draws a line but no arrowhead.
how to use pyplot.arrow or patches.Arrow in matplotlib?
===

If I wanted to draw arrows instead of axis lines using one of the arrow/Arrow functions, how do I get the line/arrowhead to show up? Example below:

    import matplotlib.pyplot as plt
    import matplotlib.patches as pts
    
    plt.ion()
    ax = plt.axes()
    ax.set(xlim=[0,1],ylim=[0,1],autoscale_on=False,clip_on=False)
    ax.set(frame_on=False,xticks=[],yticks=[])
    pts.Arrow(0,0,1,0,width=0.05)
    plt.arrow(0,0,0,1,shape='right',lw=3,fill=True)
    ax.text(1,0,'functionalization',
            verticalalignment='top',
            horizontalalignment='center')
    ax.text(0,1,'void space/structure')
    plt.draw()

pts.Arrow draws nothing, and plt.arrow draws a line but no arrowhead.