Python _ast 模块，Not() 实例源码

def refactor_ifs(stmnt, ifs):
    '''
    for if statements in list comprehension
    '''
    if isinstance(stmnt, _ast.BoolOp):
        test, right = stmnt.values
        if isinstance(stmnt.op, _ast.Or):
            test = _ast.UnaryOp(op=_ast.Not(), operand=test, lineno=0, col_offset=0)

        ifs.append(test)

        return refactor_ifs(right, ifs)
    return stmnt

def make_if(self, instr, left, and_block):
        block = [instr] + and_block[:-1]

        maxmax = max(block, key=lambda ins: (0, 0) if (ins.op not in JUMP_OPS) else (self.jump_map.get(ins.oparg, ins.oparg), ins.i))

        idx = block.index(maxmax)

        assert idx is not None

        hi = self.process_logic(block[:idx + 1])

        if hi.right is None and hi.parent is None:
            if instr.opname == 'POP_JUMP_IF_TRUE':
                cond = _ast.UnaryOp(op=_ast.Not(), operand=left, lineno=0, col_offset=0)
            else:
                cond = left

        else:
            cond = self.logic_ast(instr, left, hi)

        jump = and_block[-1]

        if jump.opname == 'RETURN_VALUE':
            body_block = block[idx + 1:] + [jump]
        else:
            body_block = block[idx + 1:]

        body = self.decompile_block(body_block).stmnt()

        if jump.is_jump:
            else_block = self.make_block(jump.to, inclusive=False, raise_=False)
        else: # it is a return
            else_block = []

        if len(else_block):
            else_ = self.decompile_block(else_block).stmnt()
#
#            if len(else_lst) == 1 and isinstance(else_lst[0], _ast.If):
#                elif_ = else_lst[0]
#                tests.extend(elif_.tests)
#                else_ = elif_.else_
#            else:
#                else_ = else_lst
        else:
            else_ = []

        if_ = _ast.If(test=cond, body=body, orelse=else_, lineno=instr.lineno, col_offset=0)

        self.ast_stack.append(if_)