get function of TraitType(BaseDescriptor) is called right after start ipython and then run forever?
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描述
Hi, I'm using ipython and trailets. I met a bug in my code and eventually lead me to try to print something inside `get` function of `TraitType(BaseDescriptor)`.
I put `print('enter get function')` before `try` block [here](https://github.com/ipython/traitlets/blob/master/traitlets/traitlets.py#L518). I observed that once I start `ipython`, `enter get function` started printing out and never stopped. It looks like `get` was called in a loop and run forever. Is there something that could help me understand this?
output
```
enter get function
enter get function
enter get function
enter get function
enter get function
...
```
Below are version info:
ipython 7.7.0
python 3.7
traitlets 4.3.3
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