Dunder request

[James-Ansley]

I can do:

• __breakpointhook__
• __displayhook__
• __excepthook__
• __interactivehook__
• __unraisablehook__
• __file__

I could also do: __stderr__,__stdin__, __stdout__, __cause__, __context__, __suppress_context__, and __traceback__ unless other people want to do something exciting with those.

[trag1c]

I assigned you the first 6, the other ones can be done in a separate PR (unless some dunder combo works better) :)