Kurtis Rader 63d601610d implement -nnn style flags in argparse
This implements support for numeric flags without an associated short or
long flag name. This pattern is used by many commands. For example `head
-3 /a/file` to emit the first three lines of the file.

Fixes 
2017-07-13 20:36:59 -07:00
..
2017-01-31 22:10:53 -08:00