gistfile1.txt

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-13-135b8e8a19a5> in <module>()
      2 
      3 field_dropdown = Dropdown(values=sorted(image_storage['10% Gas Fraction']['DD0000'].keys()))
----> 4 field_dropdown.value = ('gas', 'surface-density')
      5 
      6 sim_control = Dropdown(values=image_storage.keys())

/home/goldbaum/miniconda/lib/python2.7/site-packages/IPython/utils/traitlets.pyc in __set__(self, obj, value)
    443             # we explicitly compare silent to True just in case the equality
    444             # comparison above returns something other than True/False
--> 445             obj._notify_trait(self.name, old_value, new_value)
    446 
    447     def _validate(self, obj, value):

/home/goldbaum/miniconda/lib/python2.7/site-packages/IPython/html/widgets/widget.pyc in _notify_trait(self, name, old_value, new_value)
    371         # registered validation to be processed prior to allowing the widget
    372         # machinery to handle the state.
--> 373         LoggingConfigurable._notify_trait(self, name, old_value, new_value)
    374 
    375         # Send the state after the user registered callbacks for trait changes

/home/goldbaum/miniconda/lib/python2.7/site-packages/IPython/utils/traitlets.pyc in _notify_trait(self, name, old_value, new_value)
    600                     c(name, new_value)
    601                 elif nargs + offset == 3:
--> 602                     c(name, old_value, new_value)
    603                 else:
    604                     raise TraitError('a trait changed callback '

/home/goldbaum/miniconda/lib/python2.7/site-packages/IPython/html/widgets/widget_selection.pyc in _value_changed(self, name, old, new)
    120                 # undo the change, and raise KeyError
    121                 self.value = old
--> 122                 raise KeyError(new)
    123             finally:
    124                 self.value_lock.release()

KeyError: ('gas', 'surface-density')