Replaced internal storage object with namedtuple.

IPython/frontend/qt/console/ipython_widget.py

@@ -7,6 +7,7
 """
 
 # Standard library imports
+from collections import namedtuple
 from subprocess import Popen
 
 # System library imports
@@ -18,15 +19,6 from IPython.core.usage import default_banner
 from frontend_widget import FrontendWidget
 
 
-class IPythonPromptBlock(object):
-    """ An internal storage object for IPythonWidget.
-    """
-    def __init__(self, block, length, number):
-        self.block = block
-        self.length = length
-        self.number = number
-
-
 class IPythonWidget(FrontendWidget):
     """ A FrontendWidget for an IPython kernel.
     """
@@ -59,6 +51,10 class IPythonWidget(FrontendWidget):
     in_prompt = 'In [<span class="in-prompt-number">%i</span>]: '
     out_prompt = 'Out[<span class="out-prompt-number">%i</span>]: '
 
+    # A type used internally by IPythonWidget for storing prompt information.
+    _PromptBlock = namedtuple('_PromptBlock', 
+                              ['block', 'length', 'number'])
+
     # FrontendWidget protected class variables.
     _input_splitter_class = IPythonInputSplitter
 
@@ -212,7 +208,7 class IPythonWidget(FrontendWidget):
         self._show_prompt(self._make_in_prompt(number), html=True)
         block = self._control.document().lastBlock()
         length = len(self._prompt)
-        self._previous_prompt_obj = IPythonPromptBlock(block, length, number)
+        self._previous_prompt_obj = self._PromptBlock(block, length, number)
 
         # Update continuation prompt to reflect (possibly) new prompt length.
         self._set_continuation_prompt(