Currently, I use `sys.exit([arg])` for exiting program and it works fine.
As described in the document:
> If another type of object is passed, None is equivalent to passing zero, and
> any other object is printed to stderr and results in an exit code of 1.
However, if I want to exit the program with status 0 (or any numbers else
except 1) and print necessary messages before exiting, I have to write:
```python
print("message")
sys.exit()
```
So why `sys.exit` takes a list of arguments (`[arg]`) as its parameter? Rather
than something like `sys.exit(code:int=0, msg:str=None)`?
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