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我已经在我的电脑 win 64 位 python 2.7 上安装了。当我写进口匀称它工作正常。但是上面的错误出现在以下代码中：

import numpy as np
from scipy.spatial import Voronoi, voronoi_plot_2d
import shapely.geometry
import shapely.ops

points = np.random.random((10, 2))
vor = Voronoi(points)
voronoi_plot_2d(vor)

lines = [
shapely.geometry.LineString(vor.vertices[line])
for line in vor.ridge_vertices
if -1 not in line
]
for poly in shapely.ops.polygonize(lines):
    print poly

错误：

Traceback (most recent call last):
  File "C:\Users\Shikha\Desktop\vorn.py", line 3, in <module>
    import shapely.geometry
  File "C:\Python27\lib\site-packages\shapely-1.5.9-py2.7.egg\shapely\geometry\__init__.py", line 4, in <module>
    from .base import CAP_STYLE, JOIN_STYLE
  File "C:\Python27\lib\site-packages\shapely-1.5.9-py2.7.egg\shapely\geometry\base.py", line 9, in <module>
    from shapely.coords import CoordinateSequence
  File "C:\Python27\lib\site-packages\shapely-1.5.9-py2.7.egg\shapely\coords.py", line 8, in <module>
    from shapely.geos import lgeos
  File "C:\Python27\lib\site-packages\shapely-1.5.9-py2.7.egg\shapely\geos.py", line 145, in <module>
    prototype(_lgeos, geos_version)
  File "C:\Python27\lib\site-packages\shapely-1.5.9-py2.7.egg\shapely\ctypes_declarations.py", line 252, in prototype
    lgeos.GEOSCovers.restype = c_byte
  File "C:\Python27\lib\ctypes\__init__.py", line 378, in __getattr__
func = self.__getitem__(name)
  File "C:\Python27\lib\ctypes\__init__.py", line 383, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: function 'GEOSCovers' not found
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