获取Shapefile特征数

 import os
from osgeo import ogr

daShapefile = r"C:\Temp\Voting_Centers_and_Ballot_Sites.shp"

driver = ogr.GetDriverByName('ESRI Shapefile')

dataSource = driver.Open(daShapefile, 0) # 0 means read-only. 1 means writeable.

# Check to see if shapefile is found.
if dataSource is None:
    print 'Could not open %s' % (daShapefile)
else:
    print 'Opened %s' % (daShapefile)
    layer = dataSource.GetLayer()
    featureCount = layer.GetFeatureCount()
    print "Number of features in %s: %d" % (os.path.basename(daShapefile),featureCount)