py/objstr: Add support for the :_b/o/x specifier in str.format.

This groups non-decimal values by fours, such as bbb_bbbb_bbbb.  It also
supports `{:_d}` to use underscore for decimal numbers (grouped in threes).

Use of incorrect ":,b" is not diagnosed.

Thanks to @dpgeorge for the suggestion to reduce code size.

Signed-off-by: Jeff Epler <jepler@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/basics/string_format.py b/tests/basics/string_format.py
index e8600f583..11e7836a7 100644
--- a/tests/basics/string_format.py
+++ b/tests/basics/string_format.py
@@ -22,7 +22,17 @@ test("{:4o}", 123)
 test("{:4x}", 123)
 test("{:4X}", 123)
 
+test("{:4,d}", 1)
+test("{:4_d}", 1)
+test("{:4_o}", 1)
+test("{:4_b}", 1)
+test("{:4_x}", 1)
+
 test("{:4,d}", 12345678)
+test("{:4_d}", 12345678)
+test("{:4_o}", 12345678)
+test("{:4_b}", 12345678)
+test("{:4_x}", 12345678)
 
 test("{:#4b}", 10)
 test("{:#4o}", 123)