optparse: Fix OptionParser types

[hamdanal]

No description provided.

[hamdanal]

I want to explain the double change of parse_args's args annotation. Consider this snippet:

import optparse

parser = optparse.OptionParser()
parser.add_option("--target-dir", dest="target_dir", help="Target directory")
values, rest = parser.parse_args(["--target-dir", "/tmp"])
print(values, rest)

if you run it, it prints: {'target_dir': '/tmp'} []

1. args is now annotated as a list instead of a sequence. If you make this change to the above snippet:

   - values, rest = parser.parse_args(["--target-dir", "/tmp"])
   + values, rest = parser.parse_args(("--target-dir", "/tmp"))

   you get: AttributeError: 'tuple' object has no attribute 'pop'
2. args is now a list of strings, not AnyStr. If you make this change to the above snippet instead:

   - values, rest = parser.parse_args(["--target-dir", "/tmp"])
   + values, rest = parser.parse_args([b"--target-dir", b"/tmp"])

   you get: {'target_dir': None} [b'--target-dir', b'/tmp']
   This is not an error but it is clearly not what you intended as the program failed to parse the arguments in this case.

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉