%run的源代码设置了__file__变量，因此我们可以对此进行测试。
我们可以在sub_notebook.ipynb中写入：

try:
    __file__
    print('I am in an imported notebook')

except NameError:
    print('I am not in an imported notebook')

单独运行，将打印I am not in an imported notebook
我们可以创建一个父笔记本parent_notebook.ipynb，其中包含：

%run sub_notebook.ipynb

正确运行此命令将打印I am in an imported notebook。
我们可以在sub_notebook.ipynb中编写一个简单的测试：

def has_parent():
    """Return True if this notebook is being run by calling
    %run in another notebook, False otherwise."""
    try:
        __file__
        # __file__ has been defined, so this notebook is 
        # being run in a parent notebook
        return True

    except NameError:
        # __file__ has not been defined, so this notebook is 
        # not being run in a parent notebook
        return False

然后可以保护不应在父笔记本中打印的代码：

if not has_parent():
    print('This will not print in the parent notebook')

在子笔记本sub_notebook.ipynb的开头：
run_all_examples_display_all_outputs = '__file__' not in locals()
同样在子笔记本中，每当您有一些东西只想在运行子笔记本时运行，而不想在“导入”子笔记本时运行：
if run_all_examples_display_all_outputs: plt.show()