avoid recursion if init called more than one time #408
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```python
if _initialized:
raise ValueError("Calling init() twice will result in recursion.")
if not _initialized:
_initialized = True
```
- **Logic**: Ensures `init()` is called only once. Re-initialization would cause recursion (wrapped streams re-wrap themselves).
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init()is called only once. Re-initialization would cause recursion (wrapped streams re-wrap themselves).