Merge pull request #20 from Suzhou-Tongyuan/sjh/avoid-no-help

avoid help module is not in __builtins__

tyjuliacall/__init__.py

@@ -13,9 +13,11 @@ def _setup_help():
     class Helper(object):
         def __init__(self):
             if isinstance(__builtins__, dict):
-                self.help = __builtins__["help"]
+                if "help" in __builtins__:
+                    self.help = __builtins__["help"]
             else:
-                self.help = __builtins__.help
+                if hasattr(__builtins__, "help"):
+                    self.help = __builtins__.help
 
         def __call__(self, obj):
             if isinstance(obj, JV):
@@ -26,9 +28,11 @@ def __call__(self, obj):
                 return self.help(obj)
 
     if isinstance(__builtins__, dict):
-        __builtins__["help"] = Helper()
+        if "help" in __builtins__:
+            __builtins__["help"] = Helper()
     else:
-        __builtins__.help = Helper()
+        if hasattr(__builtins__, "help"):
+            __builtins__.help = Helper()
 
 
 _setup_help()