more RETICULATE_PYTHON cleanup

Author: edavidaja

README.md

@@ -220,8 +220,7 @@ specified package list.
 
 If there is no `requirements.txt` file or the `--force-generate` option is specified,
 the package dependencies will be determined from the current Python environment, or
-from an alternative Python executable specified via the `--python` option or via the
-`RETICULATE_PYTHON` environment variable:
+from an alternative Python executable specified via the `--python` option:
 
 ```bash
 rsconnect deploy notebook --python /path/to/python my-notebook.ipynb

rsconnect/actions.py

@@ -113,7 +113,6 @@ def which_python(python, env=os.environ):
 
     In priority order:
     * --python specified on the command line
-    * RETICULATE_PYTHON defined in the environment
     * the python binary running this script
     """
     warn("This method has been moved and will be deprecated.", DeprecationWarning, stacklevel=2)
@@ -122,9 +121,6 @@ def which_python(python, env=os.environ):
             raise RSConnectException('The file, "%s", does not exist or is not executable.' % python)
         return python
 
-    if "RETICULATE_PYTHON" in env:
-        return os.path.expanduser(env["RETICULATE_PYTHON"])
-
     return sys.executable