Class PythonDatasource

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__

(inherited documentation)

Return an iterable which yields instances of Feature for features within the passed query.

Required arguments:
  query -- a Query instance specifying the region for which features should be returned

Rarely uses. Return an iterable which yields instances of Feature for the specified point.

A convenience function to wrap an iterator yielding pairs of WKB format geometry and dictionaries of
key-value pairs into mapnik features. Return this from PythonDatasource.features() passing it a sequence of keys
to appear in the output and an iterator yielding features.

For example. One might have a features() method in a derived class like the following:

def features(self, query):
    # ... create WKB features feat1 and feat2

    return mapnik.PythonDatasource.wkb_features(
        keys = ( 'name', 'author' ),
        features = [
            (feat1, { 'name': 'feat1', 'author': 'alice' }),
            (feat2, { 'name': 'feat2', 'author': 'bob' }),
        ]
    )

A convenience function to wrap an iterator yielding pairs of WKT format geometry and dictionaries of
key-value pairs into mapnik features. Return this from PythonDatasource.features() passing it a sequence of keys
to appear in the output and an iterator yielding features.

For example. One might have a features() method in a derived class like the following:

def features(self, query):
    # ... create WKT features feat1 and feat2

    return mapnik.PythonDatasource.wkt_features(
        keys = ( 'name', 'author' ),
        features = [
            (feat1, { 'name': 'feat1', 'author': 'alice' }),
            (feat2, { 'name': 'feat2', 'author': 'bob' }),
        ]
    )