Rough draft: Proposed format specifier for a thousands separator

[Paul Rubin]

Paul Rubin <http://phr.cx@NOSPAM.invalid> writes:
>    '%.3K' % 1234567 = 1.235K     # K = 1000
>    '%.:3Ki' % 1234567 = 1.206K   # K = 1024

I meant 1.235M and 1.177M, of course.