diff options
Diffstat (limited to 'doc/source/add_argument.rst')
| -rw-r--r-- | doc/source/add_argument.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/source/add_argument.rst b/doc/source/add_argument.rst index 4bdc43e..e72df5b 100644 --- a/doc/source/add_argument.rst +++ b/doc/source/add_argument.rst @@ -244,7 +244,8 @@ If you need to do some special type-checking or type-conversions, you can provid ... value = int(string) ... sqrt = math.sqrt(value) ... if sqrt != int(sqrt): - ... raise TypeError() + ... msg = "%r is not a perfect square" % string + ... raise argparse.ArgumentTypeError(msg) ... return value ... >>> parser = argparse.ArgumentParser(prog='PROG') @@ -253,7 +254,7 @@ If you need to do some special type-checking or type-conversions, you can provid Namespace(foo=9) >>> parser.parse_args('7'.split()) usage: PROG [-h] foo - PROG: error: argument foo: invalid perfect_square value: '7' + PROG: error: argument foo: '7' is not a perfect square Note that if your type-checking function is just checking for a particular set of values, it may be more convenient to use the choices_ keyword argument:: |