minor adjustments, polished docstring

looper/conductor.py

@@ -774,11 +774,14 @@ def _reset_curr_skips(self):
 
     def check_executable_path(self, pl_iface):
         """Determines if supplied pipelines are callable.
-        Raises error and exits Looper if not callable"""
-        pl_iface = pl_iface
+        Raises error and exits Looper if not callable
+        :param dict pl_iface: pipeline interface that stores paths to executables
+        :return bool: True if path is callable.
+        """
         pipeline_commands = []
         if "path" in pl_iface.keys():
             pipeline_commands.append(pl_iface["path"])
+
         if (
             "var_templates" in pl_iface.keys()
             and "pipeline" in pl_iface["var_templates"].keys()

looper/pipeline_interface.py

@@ -9,7 +9,7 @@
 import pandas as pd
 from eido import read_schema
 from peppy import utils as peputil
-from ubiquerg import expandpath, is_url, is_command_callable
+from ubiquerg import expandpath, is_url
 from yacman import load_yaml, YAMLConfigManager
 
 from .const import *