matplotlib area fill

import numpy as np
from scipy import stats
import matplotlib.pyplot as plt

x = np.linspace(-5,5,100)
#normal distribution, mean =0, deviation = 1
y = stats.norm.pdf(x,0,1)
plt.plot(x,y)

plt.fill_between(x, y, color='yellow')

fill between normal distribution and x axis

y2 = x**2
plt.plot(x,y2)

plt.fill_between(x, y, y2, color='yellow')

plt.ylim(0, 0.4)

fill between normal distribution and parabola

plt.fill_between(x, y, y2, where=y>y2, color='yellow')

filter out outside region

reference:
https://www.quantopian.com/lectures/confidence-intervals
https://www.science-emergence.com/Articles/How-to-fill-an-area-in-matplotlib-/
https://matplotlib.org/3.1.1/gallery/lines_bars_and_markers/fill_between_demo.html