How do I update all documents in a collection with pymongo

Question

I'm using pymongo (python 3.6 with mlab), and I want to update all the documents in my collection. in my documents, I have data stored like this :

{
"_id": {
    "$oid": "5981a77e1d41c81419b60414"
},
"Ticker": "GOOGL",
"Sector": "USTECH",
"Market": "NASDAQ",
"Data": [
    {
        "Date": "Jul 27, 2017",
        "Price": "966.41",
        "Open": "969.52",
        "High": "969.52",
        "Low": "963.50",
        "Vol": "743.92K",
        "Change%": "0.11"
    },
    {
        "Date": "Jul 26, 2017",
        "Price": "965.31",
        "Open": "972.78",
        "High": "973.95",
        "Low": "960.23",
        "Vol": "2.22M",
        "Change%": "-0.38"
    }]}

And I want to update all the dates so they look like this : 1997-1-6 instead of Jan 06, 1997. I have this code :

connection = MongoClient(link)
dbase = connection[db_name]
collection = dbase.historicals
client = collection.find()
if client:  
    collection.update({}, "$set" : {"Data.Date":datetime.strptime('Date', '%b %d, %Y').date()})

connection.close()

I have tried update_many, but it seems the whole update syntax is not correct, like if it doesn't get acess to the Date field. Any tips ?

Edit : when I try this code :

client = collection.update_many({}, {"$set": {"Data": {"Date": '2000'}}})

it works, but this one doesn't client = collection.update_many({}, {"$set": {"Data": {"Date": datetime.strptime("Date", '%b %d, %Y').date()}}})

Answer 1

尝试从更新查询中删除“数据”，并在“$ set”之前和之后添加{}

collection.update({}, {"$set" : {"Date":datetime.strptime('Date', '%b %d, %Y').date()}})