gh-155043: Support copy.replace() for argparse.Namespace

[serhiy-storchaka]

Add Namespace.__replace__(), with the same semantics as types.SimpleNamespace.__replace__().

• Issue: Support copy.replace() for argparse.Namespace #155043

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #33928561 | 📁 Comparing 3da9137 against main (7ce7f0b)

  🔍 Preview build  

13 files changed · ± 13 modified

± Modified

• c-api/frame.html
• library/argparse.html
• library/asyncio-eventloop.html
• library/asyncio-stream.html
• library/asyncio-task.html
• library/decimal.html
• library/dis.html
• library/functools.html
• library/os.html
• library/stdtypes.html
• and 3 more...