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how to bulk update in mongodb using python

import pymongo
conn = pymongo.MongoClient('myserver', 8839)
db = conn['mydbname']
coll = db.myCollection
bulkop = coll.initialize_ordered_bulk_op()
retval = bulkop.find({'field1':1}).upsert().update({'$push':{'vals':1}})
retval = bulkop.find({'field1':1}).upsert().update({'$push':{'vals':2}})
retval = bulkop.find({'field1':1}).upsert().update({'$push':{'vals':3}})
retval = bulkop.execute()

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how to bulk update in mongodb using python

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