I was wondering if it might be reasonable to consider adding a set of Greek 
letters to the constants in the `string` module. In my mind, the format would 
follow the existing convention—constants for both `greek_lowercase` and 
`greek_uppercase`, as well as a combined constant `greek_letters`.

Judging by how these constants are defined in the module, this seems like it 
might be an almost trivially easy addition (with minimal future maintenance 
required), and could provide a neat little functionality. Where Python 3 
already uses unicode strings, I don't believe this would cause any backward 
compatibility issues. 

The only one drawback I can see might be polluting the namespace if it is not a 
commonly used feature. That said, the Greek alphabet is used so commonly in 
math/science that I'd hazard a guess it might be valuable for some, especially 
as unicode becomes increasingly prevalent. Obviously developers could build 
their own similar constant just by creating a string with those characters, but 
this would save a step, whether that's adding a dependency or copying/pasting a 
handful of characters. I also anticipate that the argument may come up that 
this opens a can of worms, and then why not include even more symbols. I think 
that is a valid concern, though I think the Greek alphabet is somewhat unique 
in it's prevalence (due to it's use in math/science), on top of the fact that 
it is both limited and permanent (in a way that things like logograms and 
emojis may not be).

I'm certainly not an expert on the Python source code though, so please correct 
me if there's an obvious reason not to add this or if this has been debated 
before :)
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