[matplotlib mplcursors demo] mplcursors provides a very easy way to add hover text capability to matplotlib #matplotlib #mplcursors #window_title #GridSpec #layout #tooltip #hover_text #annotation #tick_labels

mplcursors_demo.py

import matplotlib.pyplot as plt
from matplotlib import gridspec
import mplcursors

annotations0 = ['cat', 'dog', 'hare']
x = [1, 2, 3]
y = [0, 2.5, 3]

fontsize=20

suptitle = 'Title above plot'
window_title = 'window title'

fig = plt.figure(figsize=(20,20))
fig.suptitle(suptitle, fontsize=fontsize)
fig.canvas.set_window_title(window_title)
gs = gridspec.GridSpec(1, 1)

ax0 = fig.add_subplot(gs[0])

plot0 = ax0.plot(x, y, marker='o', color='k', linestyle='None', markersize='8')
cursor_plot0 = mplcursors.cursor(plot0)
cursor_plot0.connect('add', lambda sel: sel.annotation.set_text(annotations0[sel.target.index]))

ax0.grid(True)
ax0.set_xlabel('X', fontsize=fontsize)
ax0.set_ylabel('Y', fontsize=fontsize)

plt.setp(ax0.get_xticklabels(), visible=True, fontsize=fontsize) # Modify tick label properties.
plt.setp(ax0.get_yticklabels(), visible=True, fontsize=fontsize)
ax0.set_aspect('equal', 'box')  # Gives the x-axis and the y-axis the same scaling.   

plt.show()