Support NamedTuple created via kwargs

[shaperilio]

PyLance version 2021.7.2
Python extension version 2021.6.944021595
VSCode version 1.58.0
Python 3.8.10 (virtual environment)
Windows 10

from typing import NamedTuple

Result = NamedTuple('Result', a=int, one_over_a=float)

s = Result(5, 0.2)
print(s.a)

I expect to get a suggestion for s.a and s.one_over_a as I typed that print statement; instead I get count, index, __add__, etc.

Logs

[Info  - 11:04:06 AM] Pylance language server 2021.7.2 (pyright adb49aaa) starting
[Info  - 11:04:06 AM] Server root directory: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist
[Info  - 11:04:06 AM] No configuration file found.
[Info  - 11:04:06 AM] No pyproject.toml file found.
[Info  - 11:04:06 AM] Setting pythonPath for service "my_code": "c:\Users\1\my_code\venv\Scripts\python.exe"
[Warn  - 11:04:06 AM] stubPath c:\Users\1\my_code\typings is not a valid directory.
[Info  - 11:04:06 AM] Assuming Python version 3.8
[Info  - 11:04:06 AM] Assuming Python platform Windows
Search paths for c:\Users\1\my_code
  c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib
  c:\Users\1\my_code
  c:\Users\1\my_code\typings
  c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stubs\...
  c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\bundled\stubs
  c:\Program Files\Python38\DLLs
  c:\Program Files\Python38\Lib
  c:\Program Files\Python38
  c:\Users\1\my_code\venv
  c:\Users\1\my_code\venv\Lib\site-packages
  c:\Users\1\my_code\venv\Lib\site-packages\win32
  c:\Users\1\my_code\venv\Lib\site-packages\win32\lib
  c:\Users\1\my_code\venv\Lib\site-packages\pythonwin
[Info  - 11:04:06 AM] Searching for source files
[Info  - 11:04:07 AM] Auto-excluding c:\Users\1\my_code\venv
[Info  - 11:04:07 AM] Found 59 source files
[Info  - 11:04:07 AM] Background analysis(1) root directory: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist
[Info  - 11:04:07 AM] Background analysis(1) started
Background analysis message: setConfigOptions
Background analysis message: ensurePartialStubPackages
Background analysis message: setTrackedFiles
Background analysis message: markAllFilesDirty
Background analysis message: setFileOpened
Background analysis message: setFileOpened
Background analysis message: getSemanticTokens full
[BG(1)] getSemanticTokens full at Untitled-2 ...
[BG(1)]   parsing: Untitled-2 (12ms)
[BG(1)]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\builtins.pyi [fs read 2ms] (58ms)
[BG(1)]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\builtins.pyi (24ms)
[BG(1)]   binding: Untitled-2 (0ms)
[BG(1)]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing.pyi [fs read 1ms] (21ms)
[BG(1)]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing.pyi (9ms)
[BG(1)]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\_typeshed\__init__.pyi [fs read 1ms] (6ms)
[BG(1)]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\_typeshed\__init__.pyi (1ms)
[BG(1)]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing_extensions.pyi [fs read 0ms] (1ms)
[BG(1)]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing_extensions.pyi (1ms)
[BG(1)] getSemanticTokens full at Untitled-2 (154ms)
Background analysis message: getSemanticTokens full
[BG(1)] getSemanticTokens full at Untitled-1 ...
[BG(1)]   parsing: Untitled-1 (2ms)
[BG(1)]   binding: Untitled-1 (1ms)
[BG(1)]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\collections\__init__.pyi [fs read 0ms] (9ms)
[BG(1)]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\collections\__init__.pyi ...
[BG(1)]     parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\_collections_abc.pyi [fs read 1ms] (1ms)
[BG(1)]     binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\_collections_abc.pyi (0ms)
[BG(1)]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\collections\__init__.pyi (9ms)
[BG(1)]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\dataclasses.pyi [fs read 0ms] (5ms)
[BG(1)]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\dataclasses.pyi (1ms)
[BG(1)]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\abc.pyi [fs read 1ms] (1ms)
[BG(1)]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\abc.pyi (1ms)
[BG(1)] getSemanticTokens full at Untitled-1 (48ms)
Background analysis message: getSemanticTokens range
[BG(1)] getSemanticTokens range 0:0 - 56:0 at Untitled-2 (1ms)
Background analysis message: getDiagnosticsForRange
Background analysis message: invalidateAndForceReanalysis
Background analysis message: getDiagnosticsForRange
[FG] parsing: Untitled-2 (103ms)
[FG] parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\builtins.pyi [fs read 2ms] (57ms)
[FG] binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\builtins.pyi (23ms)
[FG] binding: Untitled-2 (0ms)
[Info  - 11:04:07 AM] Searching for source files
[Info  - 11:04:08 AM] Auto-excluding c:\Users\1\my_code\venv
[Info  - 11:04:08 AM] Found 59 source files
Background analysis message: setTrackedFiles
Background analysis message: markAllFilesDirty
Background analysis message: analyze
[Info  - 11:04:08 AM] Searching for source files
[Info  - 11:04:09 AM] Auto-excluding c:\Users\1\my_code\venv
[Info  - 11:04:09 AM] Found 59 source files
[BG(1)] analyzing: Untitled-2 ...
[BG(1)]   parsing: Untitled-2 (108ms)
[BG(1)]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\builtins.pyi [fs read 0ms] (31ms)
[BG(1)]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\builtins.pyi (20ms)
[BG(1)]   binding: Untitled-2 (0ms)
[BG(1)]   checking: Untitled-2 ...
[BG(1)]     parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing.pyi [fs read 0ms] (12ms)
[BG(1)]     binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing.pyi (3ms)
[BG(1)]   checking: Untitled-2 (16ms)
[BG(1)] analyzing: Untitled-2 (175ms)
Background analysis message: markFilesDirty
Background analysis message: invalidateAndForceReanalysis
Background analysis message: invalidateAndForceReanalysis
Background analysis message: markFilesDirty
Background analysis message: markFilesDirty
Background analysis message: markFilesDirty
Background analysis message: setTrackedFiles
Background analysis message: markAllFilesDirty
Background analysis message: analyze
[BG(1)] analyzing: Untitled-2 ...
[BG(1)]   parsing: Untitled-2 (93ms)
[BG(1)]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\builtins.pyi [fs read 0ms] (14ms)
[BG(1)]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\builtins.pyi (8ms)
[BG(1)]   binding: Untitled-2 (1ms)
[BG(1)]   checking: Untitled-2 ...
[BG(1)]     parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing.pyi [fs read 0ms] (4ms)
[BG(1)]     binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing.pyi (9ms)
[BG(1)]     parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\_typeshed\__init__.pyi [fs read 1ms] (3ms)
[BG(1)]     binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\_typeshed\__init__.pyi (0ms)
[BG(1)]     parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing_extensions.pyi [fs read 1ms] (2ms)
[BG(1)]     binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing_extensions.pyi (1ms)
[BG(1)]   checking: Untitled-2 (24ms)
[BG(1)] analyzing: Untitled-2 (140ms)
Background analysis message: resumeAnalysis
[BG(1)] analyzing: Untitled-1 ...
[BG(1)]   parsing: Untitled-1 (1ms)
[BG(1)]   binding: Untitled-1 (1ms)
[BG(1)]   checking: Untitled-1 ...
[BG(1)]     parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\collections\__init__.pyi [fs read 0ms] (2ms)
[BG(1)]     binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\collections\__init__.pyi ...
[BG(1)]       parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\_collections_abc.pyi [fs read 1ms] (1ms)
[BG(1)]       binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\_collections_abc.pyi (1ms)
[BG(1)]     binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\collections\__init__.pyi (3ms)
[BG(1)]     parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\dataclasses.pyi [fs read 0ms] (1ms)
[BG(1)]     binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\dataclasses.pyi (0ms)
[BG(1)]     parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\abc.pyi [fs read 0ms] (0ms)
[BG(1)]     binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\abc.pyi (1ms)
[BG(1)]   checking: Untitled-1 (23ms)
[BG(1)] analyzing: Untitled-1 (25ms)
Background analysis message: resumeAnalysis
Background analysis message: setFileOpened
[FG] completion at Untitled-2:53:8 ...
[FG]   parsing: Untitled-2 (95ms)
[FG]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\builtins.pyi [fs read 0ms] (33ms)
[FG]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\builtins.pyi (20ms)
[FG]   binding: Untitled-2 (0ms)
[FG]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing.pyi [fs read 0ms] (15ms)
[FG]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing.pyi (5ms)
[FG]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\_typeshed\__init__.pyi [fs read 0ms] (3ms)
[FG]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\_typeshed\__init__.pyi (3ms)
[FG]   parsing: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing_extensions.pyi [fs read 0ms] (1ms)
[FG]   binding: c:\Users\1\.vscode\extensions\ms-python.vscode-pylance-2021.7.2\dist\typeshed-fallback\stdlib\typing_extensions.pyi (2ms)
[FG] completion at Untitled-2:53:8 [found 38 items] (199ms)
Background analysis message: markFilesDirty
[FG] parsing: C:\Users\1\AppData\Local\Temp\pyright-18932-bclbsksi5s66\builtins-18932-qgMN3KOskCrK-.py [fs read 10ms] (67ms)
[FG] binding: C:\Users\1\AppData\Local\Temp\pyright-18932-bclbsksi5s66\builtins-18932-qgMN3KOskCrK-.py (32ms)
Background analysis message: analyze
[BG(1)] analyzing: Untitled-2 ...
[BG(1)]   parsing: Untitled-2 (1ms)
[BG(1)]   binding: Untitled-2 (0ms)
[BG(1)]   checking: Untitled-2 (5ms)
[BG(1)] analyzing: Untitled-2 (6ms)
Background analysis message: getDiagnosticsForRange
Background analysis message: getSemanticTokens delta
[BG(1)] getSemanticTokens delta previousResultId:1626113047522 at Untitled-2 (2ms)
Background analysis message: resumeAnalysis
Background analysis message: getDiagnosticsForRange
Background analysis message: getDiagnosticsForRange
Background analysis message: getDiagnosticsForRange

[erictraut]

Pylance supports two forms of NamedTuple: the class version (which is recommended if you are using types) and the list of tuples version. It doesn't currently support the form that you are using. If you switch to one of the following, it will work.

class Result(NamedTuple):
    a: int
    one_over_a: float

Result = NamedTuple("Result", [("a", int), ("one_over_a", float)])

[shaperilio]

Got it, thanks. Any plans to support the form I used?

Why is the class form recommended?

[erictraut]

No plans to support this form at this time. I've never run across it before. If a sufficient number of users request it, we would consider adding support.

The class form is easier to read (especially when types are specified), it's more like other class definitions, and it works better with tooling like pylance (e.g. with the "go to declaration" command) because the variable declarations use standard declaration syntax.

[judej]

Moving this issue to discussion as an enhancement request for comments and upvotes.