Join in mongodb using python

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join in mongo db are done via lookup operation in aggregation, so if you would like to do the join of collection1 with collection2 refer tp https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/

Sample code

# Requires the PyMongo package.
# https://api.mongodb.com/python/current

client = MongoClient('mongodb://localhost:27017/?readPreference=primaryPreferred&appname=MongoDB%20Compass&ssl=false')
result = client['db']['collection1'].aggregate([
    {
        '$lookup': {
            'from': 'collection2', 
            'localField': '$collection1field_commom', 
            'foreignField': '$collection2field_commom', 
            'as': 'joinedResult'
        }
    }
])