updates to process and pipe import code...need a way to turn

billiard on/off

Author: FredworkLemmas

memory_profiler.py

@@ -18,18 +18,21 @@
 import logging
 import traceback
 from signal import SIGKILL
-
+import importlib
 
 # TODO: provide alternative when multiprocessing is not available
-import billiard, multiprocessing
 MULTILIBS = (
-    (billiard, lambda: True if "MEMPROF_PREFERS_BILLIARD" in os.environ and \
+    ("billiard", lambda: True if "MEMPROF_PREFERS_BILLIARD" in os.environ and \
             os.environ["MEMPROF_PREFERS_BILLIARD"] in ["True", "true", "TRUE", "1"]),
-    (multiprocessing,),
-    (multiprocessing.dummy,)
+    ("multiprocessing",),
+    ("multiprocessing.dummy",)
 )
 for module_tuple in MULTILIBS:
-    multi_module, use_if_test = module_tuple
+    multi_module_name, use_if_test = module_tuple
+    try:
+        multi_module = importlib.import_module(multi_module_name)
+    except ImportError:
+        continue
     if use_if_test is None or use_if_test():
         try:
             from multi_module import Process, Pipe