Description:

`blackd` can't be run as `/usr/bin/blackd` contains:
```
#!/usr/bin/python
# -*- coding: utf-8 -*-
import re
import sys
from blackd import patched_main [d]
if __name__ == "__main__":
sys.argv[0] = re.sub(r"(-script\.pyw|\.exe)?$", "", sys.argv[0])
sys.exit(patched_main [d]())
```

Removing ` [d]` from both lines containing it fixes the problem.

Additional info:
* package version: 21.6b0-2

Steps to reproduce:
- Install `python-blackd`
- Run `blackd`