Annual rebalancing with EOD quandl data

Hello all,

As the title suggests I am having difficulty creating a boolean condition inside OnData to check if a current bar represents the beginning of a new year compared to the previous bar

def OnData(self, data):

if not self.Portfolio.Invested: #initialise holdings at backtest start
self.SetHoldings(self.vti, 0.3)

if ' ' ' boolean to compare current datetime with previous bar datetime' ' ' :
self.SetHoldings(self.vti, 0.3)

Has anyone got an example of how to check this?

Thank you in advance

Hey Louis,

You can achieve annual rebalancing by keeping a pointer of the year when you last rebalanced. We can initialize this pointer to -1 when we start our algorithm so that it immediately rebalances.

def Initialize(self):
        self.SetStartDate(2015, 1, 1)  # Set Start Date
        self.SetCash(100000)  # Set Strategy Cash
        self.AddEquity("SPY", Resolution.Daily).Symbol
        self.lastYear = -1

and then in OnData we can rebalance when the year has changed.

def OnData(self, data):
        if self.Time.year == self.lastYear:
            return
        self.lastYear = self.Time.year
        self.SetHoldings("SPY", 0.5)

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