The command line parameter -m can start the module in a modular manner. At this time, the name is the module name (not __main__), and relative import can be added to the program.
The -m operation must be executed in the directory above the module (not in the current directory) , format: python -m new.w3school_spider
Remember there is no .py at the end.

You can also put items.py directly into spiders. At this time, items.py and w3school_spider.py are in the same
folder. By default, relative import is performed, directly from items import W3schoolItem

The first error is because Python did not find the module you want in the same file. The second error is because the running module
(named __main__) cannot have relative imports.

Try adding

import sys
#加入w3school的路径
sys.path.append('/path/to')   

And the relative path is relative to the current module name, and the main module name must be "__main__", so
the package with the relative path cannot be found in the main module, and the absolute path must be used. Relative paths can only be used for non-main modules

• w3school

  • spiders

    • __init__.py

    • w3school_spider.py

  • __init__.py

  • items.py

Is your directory structure like this, and then reference the content in items.py in w3school_spider.py?

from ..items import W3schoolItem

This should do the trick.
In a package, peers use .，父级使用...

Finally, there is a suggestion, you can put some commonly used classes or functions in a package into __init__.py.