.nested_scopes: ._Feature
.generators: ._Feature
.division: ._Feature
.absolute_import: ._Feature
.with_statement: ._Feature
.print_function: ._Feature
.unicode_literals: ._Feature
.generator_stop: ._Feature
.annotations: ._Feature

._Feature: ClassType
._Feature.
    optional: (Nat, Nat, Nat, Str, Nat)
    mandatory: (Nat, Nat, Nat, Str, Nat) or NoneType
    compiler_flag: Nat
    __call__: (
        optional: (Nat, Nat, Nat, Str, Nat),
        mandatory: (Nat, Nat, Nat, Str, Nat) or NoneType,
        compiler_flag : Nat,
    ) -> ._Feature