Allowed characters in keys

Would you please explain the rationale behind allowing only string.ascii_letters + string.digits + "_" in keys? I would like to use greek letters and end up with silent errors like:

>>> a = Box()
>>> a.σeq = 1
>>> a.µeq = 2
>>> a
<Box: {'σeq': 2}>

Is there anything wrong with adding more utf-8 characters to allowed?

[cdgriffith]

Box 6 has been released with this added, thanks for opening the issue!

[cdgriffith]

While testing this found out something “fun”.

>>> a = Box()
>>> a.σeq = 1
>>> a.µeq = 2
>>> a
Box({'σeq': 1, 'μeq': 2})
>>> a == Box({'σeq': 1, 'µeq': 2})
False

Python uses NFKC normalization on variables and attributes behind the scenes. AKA

µ = 1
>>> print(dir()[-1])
μ
>>> ord(dir()[-1])
956
>>> ord('µ')
181

So that’s something to be very wary of, implementation discussed https://www.python.org/dev/peps/pep-3131/#implementation