Documentation links

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Objects in class AST

_fields (attribute in class ast.AST) — http://docs.python.org/release/2.7/library/ast.html#ast.AST._fields

Objects in class somenamedtuple

_fields (attribute in class collections.somenamedtuple) — http://docs.python.org/release/2.7/library/collections.html#collections.somenamedtuple._fields