I am trying to us the option chain provider to to give me all options contracts that exist for a given underlying at the algorithm time. I then want to sort these contracts by those with an expiration date on the coming Friday. I then want to subscribe to all these contracts and add them to my universe. However, when I try to do math on my list of contracts that I am supposed to be subscribed to, I get an error saying that the list of contracts is empty. What is the correct way to subscribe to these contracts? Code attached.



import datetime
import numpy as np
class QuantumOptimizedCoreWave(QCAlgorithm):

def Initialize(self):
self.SetStartDate(2019, 11, 29) # Set Start Date
self.SetCash(100000) # Set Strategy Cash
self.equity = self.AddEquity("SPY", Resolution.Minute)

def OnData(self, data):
contracts = self.OptionsFilter(data)

for contract in contracts:
if contract.Right == 1:
strike_prices = np.append(strike_prices, contract.Strike)
call_open_interest = np.append(call_open_interest, contract.OpenInterest)
if contract.Right == 0:
put_open_interest = np.append(put_open_interest, contract.OpenInterest)

put_minimum_OI = np.argmin(put_open_interest) # I am getting an argmin error on an empty list

def OptionsFilter(self, data):

selected = []

contracts = self.OptionChainProvider.GetOptionContractList(self.equity.Symbol, data.Time) # Gets every options contract available for the underlying symbol at that time

d = self.Time

while d.weekday() != 4: # Trying to find contracts with expiration on the coming Friday

d += datetime.timedelta(1)

# d = d + timedelta(7) # finds the contracts expiring in two weeks instead of one

for contract in contracts:

if contract.Expiry == d:

selected.append(contract) # Supposed to append contracts that expire the coming Friday

for contract in selected:
self.AddOptionContract(contract, Resolution.Minute) # Supposed to subscribe to all contracts in list

return selected # Supposed to return the list of selected contracts