On Tue, May 1, 2018 at 8:04 AM, Jacco van Dorp <j.van.dorp@deonet.nl> wrote:

2018-05-01 14:54 GMT+02:00 Greg Ewing <greg.ewing@canterbury.ac.nz>:
> Rhodri James wrote:
>>
>> I'd be interested to know if there is a readability difference between
>> really_long_descriptive_identifier_name and
>> ReallyLongDescriptiveIdentifierNames.
>
>
> As one data point on that, jerking my eyes quickly across
> that line I found it much easier to pick out the component
> words in the one with underscores.

Which is funny, because I had the exact opposite.

Might it be that we've had different conditioning ?

Almost certainly. I started using CamelCase in the mid-'80s and it seems very natural to me, since we still use it for (as you mention) GUI packages derived from C extension modules with that convention. On the other hand, I've also written a lot of snake_form identifiers in non-GUI Python, so that seems fairly natural to me, too.