[Python] Trying to print datetime throws NotImplementedError: date_to_string_with_offset

[Freymaurer]

Description

Trying to print System.DateTime with automatic string conversion throws error.

Repro code

open System

let (isParsable: bool), (dt: DateTime) = System.DateTime.TryParse("2018-10-01T11:12:55.00Z")
let expected = System.DateTime(2018, 10, 1, 13, 12, 55)

printfn "isParsable: %A" isParsable

printfn "result: %A" dt // without this line, the code runs.

printfn "isEqual: %A" (dt = expected)

Expected and actual results

Expected results

Printing all information.

Actual results

With printfn "result: %A" dt the code throws:

isParsable: true
Traceback (most recent call last):
  File "C:\Users\Freym\Desktop\fable_test\test.py", line 29, in <module>
    to_console(printf("result: %A"))(dt)
  File "C:\Users\Freym\Desktop\fable_test\fable_modules\fable_library\string_.py", line 165, in _
    str_copy = format_once(str_copy, arg)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Freym\Desktop\fable_test\fable_modules\fable_library\string_.py", line 157, in format_once
    ret = _fs_format_regexp.sub(match, str2, count=1)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Freym\Desktop\fable_test\fable_modules\fable_library\string_.py", line 154, in match
    once: str = format_replacement(rep, flags, pad_length, precision, format)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Freym\Desktop\fable_test\fable_modules\fable_library\string_.py", line 110, in format_replacement
    rep = date_to_string(rep)
          ^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Freym\Desktop\fable_test\fable_modules\fable_library\date.py", line 460, in to_string
    return date_to_string_with_offset(date, format)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Freym\Desktop\fable_test\fable_modules\fable_library\date.py", line 426, in date_to_string_with_offset
    raise NotImplementedError("date_to_string_with_offset")
NotImplementedError: date_to_string_with_offset

Related information

• Fable version: dotnet fable --version: 4.19.2
• Operating system: Win 11 Pro

[Freymaurer]

Plus a minor issue with System.DateTimeOffset.TryParse().

I just checked and the following f# throws the error: TypeError: try_parse() missing 3 required positional arguments: 'unsigned', 'bitsize', and 'defValue'.

let str  = """2008-01-05 6:00:00"""

let is_parsable, dt_offset = DateTimeOffset.TryParse(str)

transpiled to

def _arrow2(__unit: None=None) -> tuple[bool, Any]:
    out_arg: Any = min_value()
    def _arrow0(__unit: None=None) -> Any:
        return out_arg

    def _arrow1(v: Any) -> None:
        nonlocal out_arg
        out_arg = v

    return (try_parse(str_1, FSharpRef(_arrow0, _arrow1)), out_arg)

# with

def try_parse(string: str, style: int, unsigned: bool, bitsize: int, defValue: FSharpRef[datetime]) -> bool:
    try:
        defValue.contents = parse(string)
        return True
    except Exception:
        return False

For try_parse the arguments style: int, unsigned: bool, bitsize: int are unused