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How to use _filter_nodes method in ATX

Best Python code snippet using ATX

expr.py

Source:expr.py

...112# partition all AST nodes113_all_nodes = frozenset(filter(lambda x: isinstance(x, type) and114                              issubclass(x, ast.AST),115                              (getattr(ast, node) for node in dir(ast))))116def _filter_nodes(superclass, all_nodes=_all_nodes):117    """Filter out AST nodes that are subclasses of ``superclass``."""118    node_names = (node.__name__ for node in all_nodes119                  if issubclass(node, superclass))120    return frozenset(node_names)121_all_node_names = frozenset(map(lambda x: x.__name__, _all_nodes))122_mod_nodes = _filter_nodes(ast.mod)123_stmt_nodes = _filter_nodes(ast.stmt)124_expr_nodes = _filter_nodes(ast.expr)125_expr_context_nodes = _filter_nodes(ast.expr_context)126_slice_nodes = _filter_nodes(ast.slice)127_boolop_nodes = _filter_nodes(ast.boolop)128_operator_nodes = _filter_nodes(ast.operator)129_unary_op_nodes = _filter_nodes(ast.unaryop)130_cmp_op_nodes = _filter_nodes(ast.cmpop)131_comprehension_nodes = _filter_nodes(ast.comprehension)132_handler_nodes = _filter_nodes(ast.excepthandler)133_arguments_nodes = _filter_nodes(ast.arguments)134_keyword_nodes = _filter_nodes(ast.keyword)135_alias_nodes = _filter_nodes(ast.alias)136# nodes that we don't support directly but are needed for parsing137_hacked_nodes = frozenset(['Assign', 'Module', 'Expr'])138_unsupported_expr_nodes = frozenset(['Yield', 'GeneratorExp', 'IfExp',139                                     'DictComp', 'SetComp', 'Repr', 'Lambda',140                                     'Set', 'AST', 'Is', 'IsNot'])141# these nodes are low priority or won't ever be supported (e.g., AST)142_unsupported_nodes = ((_stmt_nodes | _mod_nodes | _handler_nodes |143                       _arguments_nodes | _keyword_nodes | _alias_nodes |144                       _expr_context_nodes | _unsupported_expr_nodes) -145                      _hacked_nodes)146# we're adding a different assignment in some cases to be equality comparison147# and we don't want `stmt` and friends in their so get only the class whose148# names are capitalized149_base_supported_nodes = (_all_node_names - _unsupported_nodes) | _hacked_nodes...

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