I need to add several rectangles in my basemap. I nee four rectangles with lat and log ranges as below.

1) llcrnrlon=-10, urcrnrlon=10, llcrnrlat=35,urcrnrlat=60

2) llcrnrlon=10.5, urcrnrlon=35, llcrnrlat=35,urcrnrlat=60

3) llcrnrlon=35.5, urcrnrlon=52, llcrnrlat=30,urcrnrlat=55

4) llcrnrlon=-20, urcrnrlon=35, llcrnrlat=20,urcrnrlat=34.5

My script is below. I found "polygon" packages to add lines but I do not exactly know how to do. Please help me!! Thanks a lot for your help in advance!

    from mpl_toolkits.basemap import Basemap

     m=basemaputpart.Basemap(llcrnrlon=-60, llcrnrlat=20, urcrnrlon=60, urcrnrlat=70, resolution='i', projection='cyl', lon_0=0, lat_0=45)

    lon1=np.array([[-180.+j*0.5 for j in range(721)]  for i in range(181)])
    lat1=np.array([[i*0.5 for j in range(721)]  for i in range(181)  ])
    Nx1,Ny1=m(lon1,lat1,inverse=False)

    toplot=data[:,:]
    toplot[data==0]=np.nan
    toplot=np.ma.masked_invalid(toplot)
    plt.pcolor(Nx1,Ny1,np.log(toplot),vmin=0, vmax=5)
    cbar=plt.colorbar()

    m.drawcoastlines(zorder=2)
    m.drawcountries(zorder=2)

    plt.show()