#9444: use first of prefix_chars for help opt instead of raising error
An argparse option parser created with a prefix_chars that did not
include a '-' would happily add -h and --help options, and then throw
an error when it tried to format the help because the - was an invalid
prefix character. This patch makes it use the first character of
prefix_chars as the character for the help options if and only if '-'
is not one of the valid prefix_chars.
Fix by Theodore Turocy, unit tests by Catherine Devlin.
diff --git a/Misc/NEWS b/Misc/NEWS
index a1f07f7..1780e5d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -35,6 +35,10 @@
Library
-------
+- Issue #9444: Argparse now uses the first element of prefix_chars as
+ the option character for the added 'h/help' option if prefix_chars
+ does not contain a '-', instead of raising an error.
+
- Issue #7372: Fix pstats regression when stripping paths from profile
data generated with the profile module.