import matplotlib.pyplot as plt


def draw(x_points=None, y_points=None):
    plt.plot(x_points)
    plt.show()


def draw_two(x_list1=None, x_list2=None):
    fig, ax = plt.subplots()
    ax.plot(x_list1)
    ax.plot(x_list2)
    ax.legend()
    plt.show()

def draw_three(x_list1=None, x_list2=None, x_list3=None):
    fig, ax = plt.subplots()
    ax.plot(x_list1)
    ax.plot(x_list2)
    ax.plot(x_list3)
    ax.legend()
    plt.show()