python - 投影图国家边界

Question

我使用此代码绘制法国上空的投影中心：

from sys import argv

from numpy import array,histogram

from numpy import *

from math import *

from matplotlib.pyplot import *

from matplotlib.image import *

from mpl_toolkits.basemap import Basemap, shiftgrid

from matplotlib import rcParams

import matplotlib.pyplot as plt

import matplotlib.mlab as mlab

import matplotlib.patches as patches

import matplotlib.path as path

import matplotlib.dates as dt

from numpy import linalg

def continents():

 lat=[]

 lon=[]

 for lig in file('24840.dat') :

   ligne=lig.split()


   if len(ligne[0]) > 1 :

     lon.append(ligne[0])

     lat.append(ligne[1])

   else:

     plot(lon,lat,'k',linewidth=0.5)

     lat=[]

     lon=[]

m = Basemap(width=12000000,height=9000000,projection='lcc',\
            resolution='l',lat_1=42,lat_2=52,lat_0=47,lon_0=8)

m.scatter(xlon,xlat,s=45,c=z,vmin=0,vmax=30,cmap=cm.get_cmap('jet', 45),edgecolors='None')

continents() 

m.drawcountries(linewidth=0.3)

m.drawstates(linewidth=0.3)

ax=colorbar()

xlim(-6,10)

ylim(42,52)


show()

我想看看法国的边界，但它不起作用......你看到缺少什么了吗？