Can I define a regular polyline function in one line?(2)y=-x,y=x

Question

(ref)

Can I define a regular polyline function in one line?(1)y=x,y=0

(question)

Can I define a line function in one line because it is regular?

graph orenge line : myPoly

Conditions :

The image oscillates between Y=-x and Y=X.

The slope of the line is 2 or -2.

You can start with (2,0).

y=-x,y=x

Can this also be calculated using log?

i try solve

    from sympy import *
    var('x y')
    import matplotlib.pyplot as plt
    def myPolyY(Ho, myX):
        myY = 0
        xx = [x[0] for x in Ho]
        yy = [x[1] for x in Ho]
        for i in range(len(xx) - 1):
            if xx[i] <= myX & myX <= xx[i + 1]:
               myY = (yy[i + 1] - yy[i]) / (xx[i + 1] - xx[i]) * (myX - xx[i]) + yy[i]
        return myY
    def myPolyDef(nMax):
        myPoly = [[0, 0], [2, 0]]
        i = 2
        ans = solve([y - x,
                     y - myPoly[i - 1][1] - 2 * (x - myPoly[i - 1][0])], [x, y])
        myPoly = myPoly + [[ans[x], ans[y]]]
        i = 1
        for j in range(nMax):
            i = i + 1
            ans = solve([y - (-x), y - myPoly[i][1] + 2 * (x - myPoly[i][0])], [x, y])
            myPoly = myPoly + [[ans[x], ans[y]]]
            i = i + 1
            ans = solve([y - x,
                         y - myPoly[i][1] - 2 * (x - myPoly[i][0])], [x, y])
            myPoly = myPoly + [[ans[x], ans[y]]]
        return myPoly
    def myPolyPlot(Ho, myLabel, myLinestyle):
        plt.plot([x[0] for x in Ho], [x[1] for x in Ho], mec='none', ms=4, lw=1, label=myLabel, linestyle=myLinestyle)
        for i in range(len(Ho)):
            if i % 2 == 0:
                myPos = 'right'
            else:
                myPos = 'left'
            plt.text(Ho[i][0], Ho[i][1], '({x}, {y})'.format(x=Ho[i][0], y=Ho[i][1]),
                     fontsize=6, horizontalalignment=myPos)
        return
    def myPolyNon(Ho, myLabel, myLinestyle):
        plt.plot([x[0] for x in Ho], [x[1] for x in Ho], mec='none', ms=4, lw=1, label='', linestyle='')
        return
    def main():
        # myN=4
        myN = 2
        myX = 200
        myPoly = myPolyDef(myN)
        myY = myPolyY(myPoly,myX)
        # matplotlib
        myH = max(list(map(lambda x: max(x), myPoly)))
        plt.axes().set_aspect('equal')
        plt.text(myX, myY, '({x}, {y})'.format(x=myX, y=myY),
                 fontsize=6, horizontalalignment='left')
        myPolyPlot([[myH, myH], [0, 0]], 'Y= X', '--')
        myPolyPlot(myPoly, 'myPoly', '-')
        myPolyPlot([[myH,-myH], [0, 0]], 'Y=-x', '--')
        myPolyNon ([[myH*2, -myH], [0, -myH]], '', '')
        plt.legend(frameon=False, fontsize=10, numpoints=1, loc='upper left')
        # plt.savefig('myPoly.png', dpi=200)
        plt.show()
    if __name__ == '__main__':
        main()