New submission from Max Rothman:
In the case detailed below, argparse.ArgumentParser improperly parses the
argument string "-_":
```
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('first')
print(parser.parse_args(['-_']))
```
Expected behavior: prints Namespace(first='-_')
Actual behavior: prints usage message
The issue seems to be specific to the string "-_". Either character alone or
both in the opposite order does not trigger the issue.
----------
components: Library (Lib)
messages: 288929
nosy: Max Rothman
priority: normal
severity: normal
status: open
title: Arparse improperly handles "-_"
type: behavior
versions: Python 3.6
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Python tracker <[email protected]>
<http://bugs.python.org/issue29715>
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