added filter warnings for older versions of python (<3.7)

This is a "squash" of three commits into one. This means that the intermediate history has been rewritten.

IPython/core/interactiveshell.py

@@ -803,8 +803,10 b' class InteractiveShell(SingletonConfigurable):'
         This will allow deprecation warning of function used interactively to show
         warning to users, and still hide deprecation warning from libraries import.
         """
+        if sys.version_info < (3,7):
         warnings.filterwarnings("default", category=DeprecationWarning, module=self.user_ns.get("__name__"))
 
+
     def init_builtins(self):
         # A single, static flag that we set to True.  Its presence indicates
         # that an IPython shell has been created, and we make no attempts at