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-rw-r--r--Lib/argparse.py5
1 files changed, 3 insertions, 2 deletions
diff --git a/Lib/argparse.py b/Lib/argparse.py
index e3a49e7..33c5d70 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -855,6 +855,7 @@ class Action(_AttributeHolder):
def __call__(self, parser, namespace, values, option_string=None):
raise NotImplementedError(_('.__call__() not defined'))
+
class BooleanOptionalAction(Action):
def __init__(self,
option_strings,
@@ -936,7 +937,7 @@ class _StoreConstAction(Action):
def __init__(self,
option_strings,
dest,
- const,
+ const=None,
default=None,
required=False,
help=None,
@@ -1031,7 +1032,7 @@ class _AppendConstAction(Action):
def __init__(self,
option_strings,
dest,
- const,
+ const=None,
default=None,
required=False,
help=None,