[code-quality] Valid global and constant names

[Will S]

I am trying to understand why pylint treats module-level global variables
as constants when checking the validity of their names. I though pylint
followed PEP8 but if I look here:
https://www.python.org/dev/peps/pep-0008/#id42 I see that global variables
should follow the same format as function names (with some caveats about
beginning with a "_" or being protected by __all__).

Is the problem that it is difficult to determine whether a module-level
variable is a constant or a global variable, so it was decided to err on
the side of constants since use of global variables is generally
discouraged and the invalid-name check can be locally disabled for the few
global variables that are needed?

Will
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