Windson Yang <wiwind...@gmail.com> added the comment:

I guess we can implement using ref_count? However, I agreed 

"The use of variables that haven't been defined or set (implicitly or 
explicitly) is almost always a bad thing in any language since it indicates 
that the logic of the program hasn't been thought through properly, and is 
likely to result in unpredictable behavior."

from 
https://stackoverflow.com/questions/843277/how-do-i-check-if-a-variable-exists

----------
nosy: +Windson Yang

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<https://bugs.python.org/issue35117>
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