importmatplotlib.pyplotaspltimportnumpyasnptheta=np.arange(0,8*np.pi,0.1)a=1b=.2fordtinnp.arange(0,2*np.pi,np.pi/2.0):x=a*np.cos(theta+dt)*np.exp(b*theta)y=a*np.sin(theta+dt)*np.exp(b*theta)dt=dt+np.pi/4.0x2=a*np.cos(theta+dt)*np.exp(b*theta)y2=a*np.sin(theta+dt)*np.exp(b*theta)xf=np.concatenate((x,x2[::-1]))yf=np.concatenate((y,y2[::-1]))p1=plt.fill(xf,yf)plt.show()

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