在特定路径中自动加载python文件

Question

Working situation

I have a hello.py file with the basic function

def say_hello()
    print("hello world")
    return

And a notebook.ipynb in the same directory (making the "import" work)

%load_ext autoreload
%autoreload 2
import hello

Then everytime I update the hello.py file, the autoreload works :

hello.say_hello() 

Out >>>  "Hello world with autoreload working"

Problematic situation

When the hello.py file is not in the same directory I can not use "import" so I have:

%load_ext autoreload
%autoreload 2

from importlib.machinery import SourceFileLoader
hello = SourceFileLoader("hello", '/path/to/hello.py').load_module()

At first it works :

hello.say_hello()

Out >>> "Hello world"

But after I edit the python file :

def say_hello()
    print("hello world again")
    return

And re-execute the function, it returns the previous version of the file AND throws an error

hello.say_hello()

Out >>> "Hello world"

[autoreload of  failed: Traceback (most recent call last):
  File "C:\Program Files\Python36\Lib\site- 
packages\IPython\extensions\autoreload.py", line 244, in check
superreload(m, reload, self.old_objects)
 File "C:\Program Files\Python36\Lib\site-packages\IPython\extensions\autoreload.py", line 376, in superreload
    module = reload(module)
  File "C:\Program Files\Python36\Lib\imp.py", line 314, in reload
    return importlib.reload(module)
  File "C:\Program Files\Python36\Lib\importlib\__init__.py", line 166, in reload
    _bootstrap._exec(spec, module)
  File "<frozen importlib._bootstrap>", line 589, in _exec
AttributeError: 'NoneType' object has no attribute 'name'
]

How to autoreload a Python file in a specific path, from a Jupyter notebook ?

Answer 1

This is an ImportError python version - 3.7.

Have importlib.reload() raise ImportError if the module's spec is not found.

• raise ImportError if the module's spec is not found