4. Multi-instrument futures strategy

A multi-instrument strategy in seven steps
In SigTech's Research environment, create a new notebook and run the following seven code blocks:
1. Set up environment
# Import necessary libraries
import sigtech.framework as sig
import datetime as dtm
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# Initalise the environment
sig.init();
2. Define instruments
# Create a list of object names (found in Data)
my_instruments = [
    'C  COMDTY FUTURES GROUP', # corn
    'S  COMDTY FUTURES GROUP', # soybeans
    'SB COMDTY FUTURES GROUP' # sugar
]
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# Convert the list of object names into a list of objects
my_instruments = [sig.obj.get(i) for i in my_instruments]
3. Define historical period
As you'll need to use the start and end dates multiple times, store them as variables:
my_start = dtm.date(2019, 1, 1)
my_end = dtm.date(2020, 12, 31)
4. Define a function for creating similar RollingFutureStrategy instances
Create multiple RollingFutureStrategy instances—one for each instrument listed above. Create them using this function:
def create_rfs(instrument):
    rfs = sig.RollingFutureStrategy(
        start_date=my_start,
        end_date=my_end,
        currency=instrument.currency,
        contract_code=instrument.contract_code,
        contract_sector=instrument.contract_sector,
        rolling_rule='F_0'
    )
    # Returning the strategy object's name is needed for a future step
    return rfs.name
5. Build the RollingFutureStrategy instances inside a dictionary
Build the RollingFutureStrategy instances and store them inside a dictionary:
# Create an empty dictionary
basket = {}
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# Populate the dictionary with the chosen instruments
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# for each instrument in the dictionary
# the key is a simple description (the "asset")
# the value is the instrument object
for instrument in my_instruments:
    basket[instrument.asset] = create_rfs(instrument)
    
# Let's see what it looks like
print(basket)
6. Build the BasketStrategy
The BasketStrategy building block is a strategy of strategies—it is a container for managing multiple sub-strategies. 
With the following code build a BasketStrategy to manage the three RollingFutureStrategy instances created above:
my_bs = sig.BasketStrategy(
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    # Add the RollingFutureStrategy objects into this basket strategy
    constituent_names=basket.values(),
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    # Define the relative weights of the instruments
    # These correspond to RollingFutureStrategy objects, so:
    # Corn: 10%
    # Soybeans: 20%
    # Sugar: 70%
    # The basket strategy will strive to maintain these weightings
    weights=[0.1, 0.2, 0.7],
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    # Every three months, the basket strategy will rebalance in order to
    # maintain the weightings defined above
    rebalance_frequency='3M',
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    currency='USD',
    start_date=my_start,
    end_date=my_end
)
7. Run the basket strategy and view its performance
my_bs.plot.performance()
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Your turn: customise the strategy
Add more instruments and define each instrument's weighting in the strategy.
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