ENH: Move complex type to _typing

Author: bashtage

pandas-stubs/_typing.pyi

@@ -243,5 +243,7 @@ CSVEngine = Literal["c", "python", "pyarrow", "python-fwf"]
 
 HDFCompLib = Literal["zlib", "lzo", "bzip2", "blosc"]
 ParquetEngine = Literal["auto", "pyarrow", "fastparquet"]
-
+FileWriteMode = Literal[
+    "a", "w", "x", "at", "wt", "xt", "ab", "wb", "xb", "w+", "w+b", "a+", "a+b"
+]
 __all__ = ["npt", "type_t"]

pandas-stubs/core/generic.pyi

@@ -22,6 +22,7 @@ from pandas._typing import (
     Dtype,
     FilePath,
     FilePathOrBuffer,
+    FileWriteMode,
     FillnaOptions,
     FrameOrSeries,
     FrameOrSeriesUnion,
@@ -213,9 +214,7 @@ class NDFrame(PandasObject, indexing.IndexingMixin):
         header: _bool | list[_str] = ...,
         index: _bool = ...,
         index_label: Literal[False] | _str | list[HashableT] | None = ...,
-        mode: Literal[
-            "a", "w", "x", "at", "wt", "xt", "ab", "wb", "xb", "w+", "w+b", "a+", "a+b"
-        ] = ...,
+        mode: FileWriteMode = ...,
         encoding: _str | None = ...,
         compression: CompressionOptions = ...,
         quoting: int | None = ...,
@@ -240,9 +239,7 @@ class NDFrame(PandasObject, indexing.IndexingMixin):
         header: _bool | list[_str] = ...,
         index: _bool = ...,
         index_label: Literal[False] | _str | list[HashableT] | None = ...,
-        mode: Literal[
-            "a", "w", "x", "at", "wt", "xt", "ab", "wb", "xb", "w+", "w+b", "a+", "a+b"
-        ] = ...,
+        mode: FileWriteMode = ...,
         encoding: _str | None = ...,
         compression: CompressionOptions = ...,
         quoting: int | None = ...,