import matplotlib.pyplot as plt

x = [1, 2, 3, 4, 5, 6, 7]

y = [
    0,
    220,
    380,
    500,
    540,
    540,
    590,
]

y

[0, 220, 380, 500, 540, 540, 590]

plt.plot(x, y, 'ro')

# plt.axis([0, 10, 20, 100])

[<matplotlib.lines.Line2D at 0x7f895c338c20>]