vector.py 文件源码

def __init__(self, filename=None, driver="ESRI Shapefile"):

        if driver not in ["ESRI Shapefile", "Memory"]:
            raise IOError("driver not supported")

        if filename is None:
            driver = "Memory"
        else:
            self.filename = filename

        self.driver = ogr.GetDriverByName(driver)

        self.vector = self.driver.CreateDataSource("out") if driver == "Memory" else self.driver.Open(filename)

        nlayers = self.vector.GetLayerCount()
        if nlayers > 1:
            raise IOError("multiple layers are currently not supported")
        elif nlayers == 1:
            self.init_layer()