A variable has been defined global in a nested scope which wasn't defined in the global namespace earlier. In this case, python will create the variable in the global namespace. This is confusing and can lead to runtime bugs.

Here's an example:

In [1]: def example():
   ...:     global NOT_VAR
   ...:     NOT_VAR = "Setting value inside `example` function."
   ...:

In [2]: # Accessing NOT_VAR will cause a `NameError` until `example` is called

In [3]: NOT_VAR
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-3-fc2d63c1ce6d> in <module>
----> 1 NOT_VAR

NameError: name 'NOT_VAR' is not defined

In [4]: # After calling example, the variable is created in the global namespace.

In [5]: example()

In [6]: NOT_VAR
Out[6]: 'Setting value inside `example` function.'

ashishb / adb-enhanced

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