:3:::(exception:invalid index)(AnyType)::0:0(AnyType)
0:1:::1:(AnyType)::0:0(AnyType)
0.0:0:::1:title(StringType)::1:(StringType)
1:3:::1:group1(AnyType)::0:0(AnyType)
1.0:0:::1:authors(ListType)::1:[](ListType)
1.1:0:::1:pages(IntegerType)::1:0(IntegerType)
1.2:0:::1:price(DoubleType)::1:0.000000(DoubleType)
2:2:::1:group2(AnyType)::0:0(AnyType)
2.0:0:::1:extras(DictType)::1:{}(DictType)
2.1:0:::1:publisher(ObjectType)::1:NULL(ObjectType)
