added wurlitzer as a dependency

Author: jayendra13

matlab_kernel/kernel.py

@@ -18,14 +18,10 @@
 
 from IPython.display import Image
 from metakernel import MetaKernel, ExceptionWrapper
+from wurlitzer import pipes
 
 from . import __version__
 
-try:
-    from .wurlitzer import Wurlitzer
-except ImportError:
-    Wurlitzer = None
-
 
 class _PseudoStream:
 
@@ -88,10 +84,7 @@ def do_execute_direct(self, code):
                 self._matlab.get(0., "defaultfigureposition")[0][2:])
             self.handle_plot_settings()
 
-        if Wurlitzer:
-            retval = self._execute_async(code)
-        else:
-            retval = self._execute_sync(code)
+        retval = self._execute_async(code)
 
         settings = self._validated_plot_settings
         if settings["backend"] == "inline":
@@ -245,8 +238,8 @@ def do_shutdown(self, restart):
 
     def _execute_async(self, code):
         try:
-            with Wurlitzer(_PseudoStream(partial(self.Print, end="")),
-                           _PseudoStream(partial(self.Error, end=""))):
+            with pipes(stdout=_PseudoStream(partial(self.Print, end="")),
+                       stderr=_PseudoStream(partial(self.Error, end=""))):
                 future = self._matlab.eval(code, nargout=0, async=True)
                 future.result()
         except (SyntaxError, MatlabExecutionError, KeyboardInterrupt) as exc:

matlab_kernel/wurlitzer.py

@@ -39,5 +39,6 @@
                     "ipython (>=4.0.0)"],
           install_requires=["metakernel>=0.20.8", "jupyter_client >=4.4.0",
                             "ipython>=4.0.0",
-                            "backports.tempfile;python_version<'3.0'"]
+                            "backports.tempfile;python_version<'3.0'",
+                            "wurlitzer>=1.0.2"]
           )