fix command RunFunction execution context

mara_pipelines/commands/python.py

@@ -9,6 +9,7 @@
 from ..incremental_processing import file_dependencies
 from ..logging import logger
 from ..contexts import ExecutionContext
+from ..contexts.bash import BashExecutionContext
 
 from mara_page import html, _
 from .. import pipelines
@@ -30,7 +31,9 @@ def __init__(self, function: Callable = None, args: [str] = None, file_dependenc
         self.args = args or []
         self.file_dependencies = file_dependencies or []
 
-    def run(self) -> bool:
+    def run(self, context: ExecutionContext = None) -> bool:
+        if context is not None and not isinstance(context, BashExecutionContext):
+            raise ValueError('The context must be of type BashExecutionContext')
         dependency_type = 'RunFunction ' + self.function.__name__
         if self.file_dependencies:
             assert (self.parent)