Auto-translate keys invalid for property access?

[techtonik]

It is not documented what happens if Bunch() is expanded using dictionary notation with an element, which key is invalid for property access?

[dsc]

Can you give an example? I don't think I follow.

[luckydonald]

@dsc
Maybe something like

bunched["3"] = "foo";
bunched.3  # is not valid syntax.

bunched["foo'quotes'bar"] = "hua"
bunched.foo'quotes'bar  # does not work either.

bunched["lol2345"] = "rickrolled."
bunched.lol2345  # works.

Maybe replace all wrong characters with _ and prefix strings starting with a number with int_?

Regex for the former could be (generating only one _ for multible illegal characters:

import re
unallowed_in_variable_name = re.compile('[\W]+')
var_name = unallowed_in_variable_name.sub('_', name)  
#  {'foo-2.4;"':'foo'} becomes bunched.foo_2_4_

[dsc]

Maybe replace all wrong characters with _ and prefix strings starting with a number with int_?
...

I think it's most pythonesque to raise not require. I have code for a Bunch subclass that can validate/transform keys. I'm not sure if this really is all that useful though: almost every usecase is obscure and you could simply write a small wrapper where you insert keys (or even wrap __setitem__ / __getitem__).