Live Deploy live restart, variables getting reset

Yes, there is a way to preserve the state of your algorithm across restarts. QuantConnect provides a feature called the Object Store which allows you to save data that can be accessed in the next algorithm restart.

Here is an example of how you can use the Object Store to save and retrieve a variable:

# To save a variable
self.ObjectStore.Save("myVariable", myVariable)

# To retrieve a variable
if self.ObjectStore.ContainsKey("myVariable"):
    myVariable = self.ObjectStore.Read("myVariable")

Please note that the Object Store is intended for small pieces of data, such as algorithm state or configuration settings. It is not designed to store large amounts of data like price history or other dataset.

Also, remember that the live trading algorithm portfolio is loaded from the brokerage holdings, including open orders. So, your algorithm should not assume it starts from an empty portfolio as you may have holdings from previous deployments.

Lastly, if the algorithm is terminated unexpectedly, you should review the live algorithm portfolio at the brokerage to confirm it will behave as expected.

Hi Mia,

thank you for your reply, I would like to store a variable that contains a number, but it gives error. By reading the guide I see that I can store only strings and bytes? is that the issue? how can I store a numeric value?

Yes, you're correct. The Object Store in QuantConnect can only directly store string and bytes objects. If you want to store a numeric value, you would need to convert it to a string before saving it, and then convert it back to a number after retrieving it.

Here's how you can do it in Python:

# To save a numeric value
myNumericVariable = 123.45
self.ObjectStore.Save("myNumericVariable", str(myNumericVariable))

# To retrieve a numeric value
if self.ObjectStore.ContainsKey("myNumericVariable"):
    myNumericVariable = float(self.ObjectStore.Read("myNumericVariable"))

In this example, str() is used to convert the numeric value to a string before saving it, and float() is used to convert the string back to a number after retrieving it.