在python中安装ftfy时的ImportError。 请帮我解决这个问题。 感谢
header('Content-Type: image/png');
$urlgeo = "http://geodata.nationaalgeoregister.nl/top25raster/wms?request=GetMap&service=WMS&version=1.3.0&request=GetMap&layers=top25raster&styles=&bbox=146000,451000,149000,454000&width=600&height=600&srs=EPSG:28992&format=image/png";
print file_get_contents($urlgeo);
ImportError：没有名为extern的模块
File "/usr/local/lib/python2.7/dist-packages/setuptools/extern/__init__.py", line 1, in <module>
from pkg_resources.extern import VendorImporter