https://github.com/pwwang/python-import-system

Python import system diagram
https://github.com/pwwang/python-import-system

diagram python python-imports

Last synced: 17 days ago
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Python import system diagram

• Host: GitHub
• URL: https://github.com/pwwang/python-import-system
• Owner: pwwang
• Created: 2020-12-11T23:10:48.000Z (almost 4 years ago)
• Default Branch: master
• Last Pushed: 2020-12-12T00:24:21.000Z (almost 4 years ago)
• Last Synced: 2024-10-20T11:17:54.065Z (18 days ago)
• Topics: diagram, python, python-imports
• Language: Jupyter Notebook
• Homepage:
• Size: 16.6 KB
• Stars: 17
• Watchers: 3
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
![Python Import System](./Python_Import_System.svg)

Diagram is drawn based on python's [office documentation][1]

## Pseudo code

```python

# import name, __import__(name), importlib.import_module(name), etc

if name in sys.modules:

    if sys.modules[name] is None:

        raise ModuleNotFoundError

    else if "from import statement":

        locals()[name] = module

    else:

        return module

else:

    for finder in sys.meta_path:

        spec = finder.find_spec(name, ...)

        if spec is not None:

            if spec.loader is None:

                raise ImportError

            else:

                module = spec.loader.create_module(spec)

                spec.loader.exec_module(module)

                if "from import statement":

                    locals()[name] = module

                else:

                    return module

        else:

            continue

    else:

        raise ModuleNotFoundError

```

## Experiments

See [playground.ipynb](./playground.ipynb) for some experiments on the diagram.

[1]: https://docs.python.org/3/reference/import.html