matplotlib x axis range goes over the set range

[paul18fr]

Here are some changes. For example you can bracket abcissa values or ordinates ones, or you can also implemente Latex formula, and so on. There are many options

import matplotlib.pyplot as plt
import numpy as np
import os

x = np.arange(-4., 4.2, 0.2)
y = x**2  

Path = str(os.path.abspath(''))

fig = plt.figure(figsize=(6, 6))
  
ax = fig.add_subplot(121)
#ax2 = fig.add_subplot(122)
#ax.fig(num='This is the title')
 
# Move left y-axis and bottom x-axis to centre, passing through (0,0)
ax.spines['left'].set_position('center')
ax.spines['bottom'].set_position('zero')
# Eliminate upper and right axes
ax.spines['right'].set_color('none')
ax.spines['top'].set_color('none')
 
# Show ticks in the left and lower axes only
ax.xaxis.set_ticks_position('bottom')
ax.yaxis.set_ticks_position('left')
 
ax.set_title('Full view')
ax.plot(x, y, color='blue', label=r'Parabola $y = x^2$')
ax.set(xlim=(-4., 4.), ylim=(0., 20.))
 
plt.xlabel("X axis")
plt.ylabel(r"$Y = x^2$")
plt.legend()
# plt.show()
plt.savefig(Path + '/Fig.png',dpi=300)