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# Textbox

    import numpy as np
    import matplotlib.pyplot as plt
    from matplotlib.widgets import TextBox
    fig, ax = plt.subplots()
    plt.subplots_adjust(bottom=0.2)
    t = np.arange(-2.0, 2.0, 0.001)
    s = t ** 2
    initial_text = "t ** 2"
    l, = plt.plot(t, s, lw=2)

    def submit(text):
        ydata = eval(text)
        l.set_ydata(ydata)
        ax.set_ylim(np.min(ydata), np.max(ydata))
        plt.draw()

    axbox = plt.axes([0.1, 0.05, 0.8, 0.075])
    text_box = TextBox(axbox, 'Evaluate', initial=initial_text)
    text_box.on_submit(submit)

    plt.show()

Total running time of the script: ( 0 minutes 0.153 seconds)

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