fix locale parsing on Linux

[arenekosreal]

Linux uses locale string en_US.utf-8 instead en-us.utf-8. So I added a statement to convert between them correctly.

[DetachHead]

hmm i guess that VSCODE_NLS_CONFIG variable uses a different format to everything else. thanks!

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

sympy (https://github.com/sympy/sympy)
-     Type of "eq" is "_NotImplementedType | Unknown" (reportUnknownVariableType)
+     Type of "eq" is "_NotImplementedType | GreaterThan | Unknown | Equality | Relational | Unequality" (reportUnknownVariableType)
-     Type of "default_sort_key" is "(item: Unknown, order: Unknown | None = None) -> (tuple[tuple[Literal[5], Literal[0], str], tuple[int, tuple[Unknown, ...]], Unknown, Unknown] | Unknown | tuple[tuple[int, int, str | Unknown], tuple[int, tuple[Unknown, ...]] | tuple[int, tuple[str]], Unknown, Unknown])" (reportUnknownVariableType)
+     Type of "default_sort_key" is "(item: Unknown, order: Unknown | None = None) -> (tuple[Unknown, tuple[int, tuple[Unknown, ...]], Unknown, Unknown] | Unknown | tuple[tuple[int, int, str | Unknown], tuple[int, tuple[Unknown, ...]] | tuple[int, tuple[str]], Unknown, Unknown])" (reportUnknownVariableType)
-     Argument type is "(item: Unknown, order: Unknown | None = None) -> (tuple[tuple[Literal[5], Literal[0], str], tuple[int, tuple[Unknown, ...]], Unknown, Unknown] | Unknown | tuple[tuple[int, int, str | Unknown], tuple[int, tuple[Unknown, ...]] | tuple[int, tuple[str]], Unknown, Unknown])" (reportUnknownArgumentType)
+     Argument type is "(item: Unknown, order: Unknown | None = None) -> (tuple[Unknown, tuple[int, tuple[Unknown, ...]], Unknown, Unknown] | Unknown | tuple[tuple[int, int, str | Unknown], tuple[int, tuple[Unknown, ...]] | tuple[int, tuple[str]], Unknown, Unknown])" (reportUnknownArgumentType)
-     Argument type is "(item: Unknown, order: Unknown | None = None) -> (tuple[tuple[Literal[5], Literal[0], str], tuple[int, tuple[Unknown, ...]], Unknown, Unknown] | Unknown | tuple[tuple[int, int, str | Unknown], tuple[int, tuple[Unknown, ...]] | tuple[int, tuple[str]], Unknown, Unknown])" (reportUnknownArgumentType)
+     Argument type is "(item: Unknown, order: Unknown | None = None) -> (tuple[Unknown, tuple[int, tuple[Unknown, ...]], Unknown, Unknown] | Unknown | tuple[tuple[int, int, str | Unknown], tuple[int, tuple[Unknown, ...]] | tuple[int, tuple[str]], Unknown, Unknown])" (reportUnknownArgumentType)
-     Argument type is "(item: Unknown, order: Unknown | None = None) -> (tuple[tuple[Literal[5], Literal[0], str], tuple[int, tuple[Unknown, ...]], Unknown, Unknown] | Unknown | tuple[tuple[int, int, str | Unknown], tuple[int, tuple[Unknown, ...]] | tuple[int, tuple[str]], Unknown, Unknown])" (reportUnknownArgumentType)
+     Argument type is "(item: Unknown, order: Unknown | None = None) -> (tuple[Unknown, tuple[int, tuple[Unknown, ...]], Unknown, Unknown] | Unknown | tuple[tuple[int, int, str | Unknown], tuple[int, tuple[Unknown, ...]] | tuple[int, tuple[str]], Unknown, Unknown])" (reportUnknownArgumentType)
-     Type of "evalf" is "Unknown | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Equality | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Relational | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Unequality | EvalfMixin* | Any))" (reportUnknownMemberType)
+     Type of "evalf" is "Unknown | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Equality | EvalfMixin* | Any | Float)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Relational | EvalfMixin* | Any | Float)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Unequality | EvalfMixin* | Any | Float))" (reportUnknownMemberType)
-     Type of "evalf" is "Unknown | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Equality | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Relational | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Unequality | EvalfMixin* | Any))" (reportUnknownMemberType)
+     Type of "evalf" is "Unknown | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Equality | EvalfMixin* | Any | Float)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Relational | EvalfMixin* | Any | Float)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Unequality | EvalfMixin* | Any | Float))" (reportUnknownMemberType)
-     Type of "evalf" is "Unknown | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Mul | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Expectation | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Sum | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Self@Expr | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Order | EvalfMixin* | Any)) | Any | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Piecewise | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Equality | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Relational | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Unequality | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | Integral | EvalfMixin* | Any)) | ((n: int = 15, subs: Unknown | None = None, maxn: int = 100, chop: bool = False, strict: bool = False, quad: Unknown | None = None, verbose: bool = False) -> (Unknown | ExpectationMatrix | EvalfMixin* | Any))" (reportUnknownMemberType)

... (truncated 85 lines) ...

comtypes (https://github.com/enthought/comtypes): 277.37x slower (0.1s -> 24.8s in a single noisy sample)

[NCBM]

Although this fix is already accepted here a few weeks ago, I'm very glad to see it.

hmm i guess that VSCODE_NLS_CONFIG variable uses a different format to everything else. thanks!

Yes, and exactly locale names are slightly different generally in the whole Windows. From Locale names in Windows CRT Documentation we can know that the en-us-style names comes from IETF BCP47 and are different from names on linux.

About a few days before this PR, I created an issue microsoft/pyright#9269 about this and I've been told it is as designed.