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Python Polyfill for PEP 505 (None-aware / null-coalescing operators)

License: MIT License

Python 100.00%

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Syntax proposal

Hi Doug,

I've been reading today about PEP 505 and I wondered if the following syntax could take away the complaint about new Python users finding the .? syntax unintuitive:

x = foo -> .help -> .get_user("doug") -> ["name"]

This would be the none-aware way to access foo.help.get_user("doug")["name"].

It comes down to using -> . instead of ?. and -> [ instead of ?[. I think that new users will intuitively understand that the -> arrows form a chain that might be broken at some point (and then None is returned).

Best,
Maarten

ps I just came to the conclusion that I personally also find this syntax easier on the eyes than .?. It seems to work well on the code examples that you give in PEP505

Environment-dependent errors when using non-ASCII characters

Hello.

In a Japanese Windows environment, the following parsing error occurs when attempting to execute source code containing non-ASCII (multibyte) characters.

> python -m main
Traceback (most recent call last):
  File "C:\Python310\lib\runpy.py", line 187, in _run_module_as_main
    mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
  File "C:\Python310\lib\runpy.py", line 157, in _get_module_details
    code = loader.get_code(mod_name)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\parsinghook\hook.py", line 98, in get_code
    return FULLNAME_TO_LOADER[fullname]._parse_module()
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\parsinghook\hook.py", line 84, in _parse_module
    tree = self._parser.parse_module(f, self._filename)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\hook.py", line 52, in parse_module
    tree = parser.start()
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\parser.py", line 60, in memoize_wrapper
    tree = method(self, *args)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\parser.py", line 405, in start
    (file := self.file())
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\parser.py", line 60, in memoize_wrapper
    tree = method(self, *args)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\parser.py", line 416, in file
    (a := self.statements(),)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\parser.py", line 60, in memoize_wrapper
    tree = method(self, *args)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\parser.py", line 489, in statements
    (a := self._loop1_3())
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\parser.py", line 60, in memoize_wrapper
    tree = method(self, *args)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\parser.py", line 6463, in _loop1_3
    (statement := self.statement())
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\parser.py", line 60, in memoize_wrapper
    tree = method(self, *args)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\parser.py", line 500, in statement
    (a := self.compound_stmt())
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\parser.py", line 60, in memoize_wrapper
    tree = method(self, *args)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\parser.py", line 669, in compound_stmt
    self.positive_lookahead(self._tmp_7, )
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\parser.py", line 250, in positive_lookahead
    ok = func(*args)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\parser.py", line 60, in memoize_wrapper
    tree = method(self, *args)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\parser.py", line 6521, in _tmp_7
    (literal := self.expect('def'))
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\parser.py", line 60, in memoize_wrapper
    tree = method(self, *args)
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\parser.py", line 230, in expect
    tok = self._tokenizer.peek()
  File "C:\Sandbox\sdvx_score_tool\venv\lib\site-packages\pep505\pegen\tokenizer.py", line 46, in peek
    tok = next(self._tokengen)
  File "<string>", line 452, in _tokenize
UnicodeDecodeError: 'cp932' codec can't decode byte 0x82 in position 998: illegal multibyte sequence

The source code file itself is written in UTF-8, but we think the reason is that Python on Japanese Windows tries to open the file in CP932 (SHIFT-JIS) by default.

I don't know much about the inner workings, but if you can solve this by explicitly specifying the encoding when opening the file, please do so.

Thanks.

Pycharm Syntax Error

I will break Pycharm (or other IDE) syntax check, is there any solution?

Greeting

Surprised to see we did something similar 😀 （Just a greeting, hope it doesn't bother you.）

https://mingshe.aber.sh/en/syntax/nullish-coalescing/
https://mingshe.aber.sh/en/syntax/optional-chaining/

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