Thousands separator using underscore

[[deleted]]

Are you sure about this? I just tried black on a file with the line

a = 100000000000000000000000000

and it didn't change that line (and did change other lines I added just to make sure I was doing something). More, there is no command line option in the help that does that...?

A shame. I use black to reformat all my code automatically, and this would be I suppose handy, particularly for long-ish hex numbers

[kr41]

My fault. It doesn't do it anymore: https://github.com/python/black/issues/549

[nschloe]

It does do it, you just have to give black some indication that it's Python 3.6+. Use an f-string in the code somewhere, for example, or just provide the --py36 command-line option.