import pymongomyclient = pymongo.MongoClient("mongodb://localhost:27017/")mydb = myclient["mydatabase"]mycol = mydb["customers"]myquery = { "address": { "$regex": "^S" } }newvalues = { "$set": { "name": "Minnie" } }x = mycol.update_many(myquery, newvalues)print(x.modified_count, "documents updated.")