can't add variables to instances of built-in classes

[Lawrence D’Oliveiro]

On Tuesday, July 19, 2016 at 11:12:52 AM UTC+12, bream... at gmail.com wrote:
>
> On Monday, July 18, 2016 at 10:48:15 PM UTC+1, Lawrence D’Oliveiro wrote:
>>
>> <https://github.com/ldo/qahirah>
>> When you have lots of read/write properties, I find __slots__ to be a good
>> idea.
> 
> Please explain why, thank you.

I was trying something like

    ctx.dashes = ((0.1, 0.03, 0.03, 0.03), 0)

and wondering why it wasn’t working...