[Python] What does Python do with incorrect type hinting in global scope? [duplicate]

I found here strange Python code, something like:

myvar: "Some string"


I checked it in IPython and it works. But what does it actually do?

In [16]: myvar: "Some string"

In [17]: myvar
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
Cell In[17], line 1
----> 1 myvar

NameError: name 'myvar' is not defined

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