fix: use lru_cache in py3

Author: satra

nipype/__init__.py

@@ -6,6 +6,7 @@
 
 import os
 import functools
+import sys
 from distutils.version import LooseVersion
 
 from .info import (LONG_DESCRIPTION as __doc__, URL as __url__, STATUS as
@@ -59,7 +60,16 @@ def get_info():
                          Rename, Function, Select, Merge)
 
 
-@functools.lru_cache()
+def sys_based_cache(condition):
+    def decorator(func):
+        if not condition:
+            return func
+        else:
+            return functools.lru_cache(func)
+    return decorator
+
+
+@sys_based_cache(sys.version >= 3)
 def check_version(raise_exception=False):
     """Check for the latest version of the library