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GeoAlchemy 2 provides extensions to SQLAlchemy to work with spatial databases. GeoAlchemy 2 focuses on PostGIS. PostGIS 1.5 and PostGIS 2 are supported. Dialects other than PostgreSQL/PostGIS are not supported, and if GeoAlchemy is referenced in a question, the [geoalchemy] tag should be used in preference.
3
votes
Accepted
Geoalchemy2 && support for ST_MakeEnvelope
When you are doing
filter(expr1, expr2)
you are telling SQLAlchemy to join the two expressions with an AND (see Query#filter). That's why you are getting the error message.
Regarding the operator …