Hi.  I would like to check how much historical data is available in Coarse Selection by retrieving the starting date for a list of symbols.

According to here (https://www.quantconnect.com/docs/key-concepts/security-identifiers), using Symbol.Date as follows should work:

[x.Date for x in self.symbols]

But I get an attribute error: AttributeError : 'Symbol' object has no attribute 'Date’

When I try:

[x.Value for x in self.symbols]

for example, it works.

It also doesn’t work for Symbol.Market.  What am I missing?

Any help is greatly appreciated.