Question

我是python中的新手，请原谅我这个新手问题。我有一个班级和一个职能：

class Datasource(mapnik.PythonDatasource):
    def __init__(self):
        super(Datasource, self).__init__()

    def features(self, query):
        return mapnik.PythonDatasource.wkb_features(mvt)

def tileLayer(request, version, shapefile_id, zoom, x, y):
    mvt = requestHandler(request, zoom, x, y)

    datasource = mapnik.Python(factory='Datasource')

如何在调用mvt

时将Datasource变量传递给mapnik.Python(factory='Datasource')类

Answer 1

您可以向mapnik.Python方法添加其他参数 - 它们将传递给数据源__init__：

mvt = requestHandler(request, zoom, x, y)
datasource = mapnik.Python(factory='Datasource', mvt=mvt)

为Datasource类__init__方法定义添加参数，并使用它在类实例中保存mvt：

class Datasource(mapnik.PythonDatasource):
    def __init__(self, mvt):
        super(Datasource, self).__init__()
        self.mvt = mvt

    def features(self, query):
        return mapnik.PythonDatasource.wkb_features(self.mvt)

如何将变量传递给mapnik数据源类？

1 个答案: