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content/blog/pythonall.md
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title: "Quick Python: __all__"
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date: 2020-05-01T00:53:46-04:00
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draft: false
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tags: ["python"]
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---
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Anything that is defined inside a package that is imported is also brought into that workspace. So for example, if package `A` uses `numpy` and you import `A`, then `A.numpy` will be shown in your workspace. In order to limit the variables exported, you can define the ones you want to be shown in a variable called `__all__`.
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Inside your package `test.py`
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```python
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hidden_variable = 5
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shown_variable = 2
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__all__ = ['shown_variable']
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```
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Then if you open the standard Python REPL and import `test`, only the variable `shown_variable` will be seen.
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