refactor(pd): extract scitex.pd into standalone scitex-pd package

pyproject.toml

@@ -509,9 +509,8 @@ path = [
 
 # Pd Module - Pandas utilities
 # Use: pip install scitex[pd]
-pd = [
-    "xarray",
-]
+# Real implementation lives in the standalone scitex-pd package.
+pd = ["scitex-pd>=0.1.0"]
 
 # PLT Module - Plotting utilities
 # Use: pip install scitex[plt]

src/scitex/pd/__init__.py

@@ -1,46 +1,20 @@
-#!/usr/bin/env python3
-"""Scitex pd module."""
+"""SciTeX pd — thin compatibility shim for scitex-pd.
 
-from ._find_indi import find_indi
-from ._find_pval import _find_pval_col, find_pval
-from ._force_df import force_df
-from ._from_xyz import from_xyz
-from ._get_unique import get_unique
-from ._ignore_SettingWithCopyWarning import (
-    ignore_setting_with_copy_warning,
-    ignore_SettingWithCopyWarning,
-)
-from ._melt_cols import melt_cols
-from ._merge_columns import merge_cols, merge_columns
-from ._mv import mv, mv_to_first, mv_to_last
-from ._replace import replace
-from ._round import round
-from ._slice import slice
-from ._sort import sort
-from ._to_numeric import to_numeric
-from ._to_xy import to_xy
-from ._to_xyz import to_xyz
+Aliases ``scitex.pd`` to the standalone ``scitex_pd`` package via ``sys.modules``.
+``scitex.pd is scitex_pd``.
 
-__all__ = [
-    "find_indi",
-    "find_pval",
-    "_find_pval_col",
-    "force_df",
-    "from_xyz",
-    "get_unique",
-    "ignore_SettingWithCopyWarning",
-    "ignore_setting_with_copy_warning",
-    "melt_cols",
-    "merge_cols",
-    "merge_columns",
-    "mv",
-    "mv_to_first",
-    "mv_to_last",
-    "replace",
-    "round",
-    "slice",
-    "sort",
-    "to_numeric",
-    "to_xy",
-    "to_xyz",
-]
+Install: ``pip install scitex[pd]``  (or ``pip install scitex-pd``).
+See: https://github.com/ywatanabe1989/scitex-pd
+"""
+
+import sys as _sys
+
+try:
+    import scitex_pd as _real
+except ImportError as _e:  # pragma: no cover
+    raise ImportError(
+        "scitex.pd requires the 'scitex-pd' package. "
+        "Install with: pip install scitex[pd]  (or: pip install scitex-pd)"
+    ) from _e
+
+_sys.modules[__name__] = _real