add is_python_enabled_on_server

Author: bcwu

rsconnect/bundle.py

@@ -1062,6 +1062,15 @@ def fake_module_file_from_directory(directory: str):
     return join(directory, app_name + ".py")
 
 
+def is_python_enabled_on_server(connect_details):
+    """
+    Returns whether or not the Connect server has Python itself enabled.
+
+    :error: The Posit Connect server does not have Python enabled.
+    """
+    return any(connect_details["python"]["versions"])
+
+
 def are_apis_supported_on_server(connect_details):
     """
     Returns whether or not the Connect server has Python itself enabled and its license allows

rsconnect/main.py

@@ -40,6 +40,7 @@
 from . import api, VERSION, validation
 from .api import RSConnectExecutor, RSConnectServer, RSConnectClient, filter_out_server_info
 from .bundle import (
+    is_python_enabled_on_server,
     are_apis_supported_on_server,
     create_python_environment,
     default_title_from_manifest,
@@ -1202,6 +1203,7 @@ def deploy_app(
         (
             ce.validate_server()
             .validate_app_mode(app_mode=app_mode)
+            .check_server_capabilities([is_python_enabled_on_server])
             .check_server_capabilities([are_apis_supported_on_server])
             .make_bundle(
                 make_api_bundle,