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--- src/icalendar/cli.py.orig 2018-06-20 12:52:55 UTC
+++ src/icalendar/cli.py
@@ -86,6 +86,7 @@ def main():
# This seems a bit of an overkill now, but we will probably add more
# functionality later, e.g., iCalendar to JSON / YAML and vice versa.
subparsers = parser.add_subparsers(dest='subcommand')
+ subparsers.required = True
subparser = subparsers.add_parser(
'view', description=view.__doc__.split('\n\n')[0])
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