how to form smooth curve in matplotlib
from scipy.interpolate import make_interp_spline, BSpline
#create data
x = np.array([1, 2, 3, 4, 5, 6, 7, 8])
y = np.array([4, 9, 12, 30, 45, 88, 140, 230])
#define x as 200 equally spaced values between the min and max of original x
xnew = np.linspace(x.min(), x.max(), 200)
#define spline
spl = make_interp_spline(x, y, k=3)
y_smooth = spl(xnew)
#create smooth line chart
plt.plot(xnew, y_smooth)
plt.show()