Python & Matplotlib：将 x 轴置于中心，但刻度和标签不跟随 x 轴

Question

In Matplotlib , I want to put x-axis always go through (0, 0). Followed is a small code. As you can see, x-axis is adjusted to the middle of figure. What I want is x-axis shown at (0, 1.5) always at (0,0).

import pandas as pd
import matplotlib.pyplot as plt  

fig = plt.figure()
ax = fig.add_subplot(111)

x=[0,2.7,5.4]
y=[0,3.0,0]
ax.plot(x, y)

ax.spines['bottom'].set_position('center')
ax.spines['right'].set_color('none')
ax.spines['top'].set_color('none')
#  ax.spines['bottom'].set_color('none')

plt.gca().invert_yaxis()
plt.show()

Answer 1

From the docs , use 'zero' when setting the position of the spine:

ax.spines['bottom'].set_position('zero')

Output: