Problem.

#(1)
someList = {
    1000:[
        ("1","2","3","","5","","7","8","9")
        ],
    1001:[
        ("1","2","3","4","5","6","","8","9")
        ],
    }

#(2)
for i in range(len(listy)):
    if ( "" == listy[i+1000][i-1000:][i-1000:] ):
        print("%d\t%d\tEMPTY BLOCK\t[%d]" % (i+1000,i-000,i))
    else:
        print("%d\t%d\tFULL BLOCK\t[%d]" % (i+1000,i-000,i))