Python _ast 模块，LShift() 实例源码

def _transform_multiline_assignment_statements(statements):
    assignment_statements = [statement for statement in statements
                             if type(statement) is _ast.BinOp
                             and type(statement.op) is _ast.LShift
                             and type(statement.left) is _ast.Name]

    other_statements = [statement for statement in statements if statement not in assignment_statements]

    assignments = [ast.Assign(targets=[statement.left], value=statement.right, lineno=statement.lineno, col_offset=statement.col_offset)
            for statement in assignment_statements]

    for assignment in assignments:
        assignment.targets[0].ctx = ast.Store()

    return other_statements + assignments