#How to plot a function in python:

xspace = np.linspace(0    , 2   , 1000)
#      = np.linspace(start , end , number of points)

def f(x):
    return x**2 + 2*x + 1 #Type in your function here

plt.plot(xspace, f(xspace), 'k--', label=r'Hello') #Use xspace on this line rather than x