address nousersite issue

metaflow/plugins/pypi/conda_decorator.py

@@ -145,8 +145,8 @@ def runtime_step_cli(
         cli_args.env["PYTHONPATH"] = self.metaflow_dir.name
         # TODO: Verify user site-package isolation behavior
         #       https://github.com/conda/conda/issues/7707
-        # Important! Can otherwise leak packages to other environments
-        cli_args.env["PYTHONNOUSERSITE"] = "1"
+        # Also ref - https://github.com/Netflix/metaflow/pull/178
+        # cli_args.env["PYTHONNOUSERSITE"] = "1"
         # The executable is already in place for the user code to execute against
         if self.interpreter:
             cli_args.entrypoint[0] = self.interpreter

metaflow/plugins/pypi/conda_environment.py

@@ -161,6 +161,8 @@ def executable(self, step_name, default=None):
         # TODO: Handle the default executable case. Delegate to base_env as previously?
         step = next(step for step in self.flow if step.name == step_name)
         id_ = self.get_environment(step)["id_"]
+        # bootstrap.py is responsible for ensuring the validity of this executable.
+        # -s is important! Can otherwise leak packages to other environments.
         return os.path.join(id_, "bin/python -s")
 
     def interpreter(self, step_name):

metaflow/plugins/pypi/micromamba.py

@@ -194,7 +194,8 @@ def metadata(self, id_, packages, python, platform):
         }
 
     def interpreter(self, id_):
-        return os.path.join(self.path_to_environment(id_), "bin/python")
+        # -s is important! Can otherwise leak packages to other environments.
+        return os.path.join(self.path_to_environment(id_), "bin/python -s")
 
     def platform(self):
         return self.info()["platform"]