Syntax: matplotlib.pyplot.text(x, y, s, fontdict=None, **kwargs)

import matplotlib.pyplot
  
matplotlib.pyplot.text(0.5, 0.5, "Hello World!")
matplotlib.pyplot.savefig("out.png")

import matplotlib.pyplot as plt
  
  
w = 4
h = 3
d = 70
  
plt.figure(figsize=(w, h), dpi=d)
  
x = [1, 2, 4]
x_pos = 0.5
y_pos = 3
  
plt.text(x_pos, y_pos, "text on plot")
plt.plot(x)
plt.savefig("out.png")