Clean up nix remnants after uv migration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ElleNajt

Readme.org

@@ -98,7 +98,7 @@ Tooling to safely rename variables in an org file across all python blocks that
 
 To use, create a renamer.json in the same folder as your .org file, mark both with dired, and then run ob-python-extras/dired-rename-python-vars.
 
-By default this runs python via nix-shell. Set the variable `alternative-python-binary` to use a different python binary (e.g., from uv or system python).
+By default this runs python via =uv run python=. Set the variable =alternative-python-binary= to use a different python binary.
 
 ** Pandoc scripts:
 Configured scripts for converting org files in a directory to ipynb files, or ipynb files to org files. These rely on pandoc.

python/print_org_df.py

@@ -62,14 +62,17 @@ def disable_spark():
 
 try:
     import pandas as pd
-    from pandas.io.formats.style import Styler as PandasStyler
 
     pd.options.display.max_rows = 20
     PANDAS_AVAILABLE = True
 except ImportError:
     PANDAS_AVAILABLE = False
+    pd = None
+
+try:
+    from pandas.io.formats.style import Styler as PandasStyler
+except (ImportError, Exception):
     PandasStyler = None
-    pass
 
 try:
     import tabulate

tests/last_successful_test_system_info.md

@@ -1,4 +1,5 @@
-# Last Successful test: Sat Feb 21 19:44:33 PST 2026
+# Last Successful test: Sat Feb 21 19:56:41 PST 2026
 ## System Information
 Emacs version: GNU Emacs 30.2
-Nixpkgs commit: "26.05pre942631.fef9403a3e4d"
+Python: Python 3.13.2
+uv: uv 0.10.0

tests/run_expect_tests.sh

@@ -208,7 +208,6 @@ process_file() {
     echo "Processing file: $org_file"
 
     # Always run the tests in staging
-    cp *.nix "staging/"
     cp "$org_file" "staging/$org_file"
     eval "emacs $(get_emacs_args "staging/$org_file")"
 
@@ -275,7 +274,8 @@ else
             echo "# Last Successful test: $(date)"
             echo "## System Information"
             echo "Emacs version: $(emacs --version | head -n1)"
-            echo "Nixpkgs commit: $(nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version' 2>/dev/null || echo "Nixpkgs not found")"
+            echo "Python: $(python3 --version 2>/dev/null || echo "not found")"
+            echo "uv: $(uv --version 2>/dev/null || echo "not found")"
         } >last_successful_test_system_info.md
         exit 0
     else