[ 常見問題 ] List submodules and import them

 Source from here1 and here2

Question
How to import submodules of a given module and import them dynamically? Said I have a package A with modules as below:

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1. [23:54:22 tmp]$ tree A/  
2. A/  
3. ├── submodule1.py  
4. └── submodule2.py  

Let's say I have imported A as below and how to list submodule1 and submodule2 and then imported them?

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1. import A  
2.   
3. # TBD  
4. # List all submodules under package A and import them  

HowTo
We can leverage pkgutil & importlib. Check sample code below:
- test.py

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1. import A  
2. import importlib  
3. import pkgutil  
4.   
5.   
6. for sm_info in pkgutil.iter_modules(A.__path__):  
7.     print(f"Found submodule: {sm_info}")  
8.     submodule_name = f"A.{sm_info.name}"  
9.     print(f"Importing {submodule_name}")  
10.     modu = my_module = importlib.import_module(submodule_name)  
11.     print(f"Done: {modu.name()}")  

Execution result:

$ ./test.py
Found submodule: ModuleInfo(module_finder=FileFinder('/tmp/A'), name='submodule1', ispkg=False)
Importing A.submodule1
Done: Hello submodule1
Found submodule: ModuleInfo(module_finder=FileFinder('/tmp/A'), name='submodule2', ispkg=False)
Importing A.submodule2
Done: Hi, submodule2