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content/blog/exportpydecorator.md

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+---
+title: "Quick Python: Export Decorator"
+date: 2020-06-14T22:15:38-04:00
+draft: false
+tags: []
+---
+
+A great [StackOverflow post](https://stackoverflow.com/a/35710527) by [Aaron Hall](https://stackoverflow.com/users/541136/aaron-hall) that shows how you can create an `export` decorator in order to not have to specify all the names you want to expose via [`__all__`](https://brandonrozek.com/blog/pythonall/).
+
+The Decorator:
+
+```python
+import sys
+
+def export(fn):
+    mod = sys.modules[fn.__module__]
+    if hasattr(mod, '__all__'):
+        mod.__all__.append(fn.__name__)
+    else:
+        mod.__all__ = [fn.__name__]
+    return fn
+```
+
+Usage:
+
+```python
+__all__ = []
+
+@export # otherwise __all__ = ['test']
+def test():
+    print("test")
+```
+