Variable Inspector.ipynb
201 lines
| 5.7 KiB
| text/plain
|
TextLexer
Variable Inspector Widget¶
A short example implementation¶
This notebook demonstrates how one can use the widgets already built-in to IPython to create a working variable inspector much like the ones seen in popular commercial scientific computing environments.
In [ ]:
from IPython.html import widgets # Loads the Widget framework.
from IPython.core.magics.namespace import NamespaceMagics # Used to query namespace.
# For this example, hide these names, just to avoid polluting the namespace further
get_ipython().user_ns_hidden['widgets'] = widgets
get_ipython().user_ns_hidden['NamespaceMagics'] = NamespaceMagics
In [ ]:
class VariableInspectorWindow(object):
instance = None
def __init__(self, ipython):
"""Public constructor."""
if VariableInspectorWindow.instance is not None:
raise Exception("""Only one instance of the Variable Inspector can exist at a
time. Call close() on the active instance before creating a new instance.
If you have lost the handle to the active instance, you can re-obtain it
via `VariableInspectorWindow.instance`.""")
VariableInspectorWindow.instance = self
self.closed = False
self.namespace = NamespaceMagics()
self.namespace.shell = ipython.kernel.shell
self._popout = widgets.Popup()
self._popout.description = "Variable Inspector"
self._popout.button_text = self._popout.description
self._modal_body = widgets.VBox()
self._modal_body.overflow_y = 'scroll'
self._modal_body_label = widgets.HTML(value = 'Not hooked')
self._modal_body.children = [self._modal_body_label]
self._popout.children = [
self._modal_body,
]
self._ipython = ipython
self._ipython.events.register('post_run_cell', self._fill)
def close(self):
"""Close and remove hooks."""
if not self.closed:
self._ipython.events.unregister('post_run_cell', self._fill)
self._popout.close()
self.closed = True
VariableInspectorWindow.instance = None
def _fill(self):
"""Fill self with variable information."""
values = self.namespace.who_ls()
self._modal_body_label.value = '<table class="table table-bordered table-striped"><tr><th>Name</th><th>Type</th><th>Value</th></tr><tr><td>' + \
'</td></tr><tr><td>'.join(['{0}</td><td>{1}</td><td>{2}'.format(v, type(eval(v)).__name__, str(eval(v))) for v in values]) + \
'</td></tr></table>'
def _ipython_display_(self):
"""Called when display() or pyout is used to display the Variable
Inspector."""
self._popout._ipython_display_()
In [ ]:
inspector = VariableInspectorWindow(get_ipython())
inspector
Test¶
In [ ]:
a = 5
In [ ]:
b = 3.0
In [ ]:
c = a * b
In [ ]:
d = "String"
In [ ]:
del b
In [ ]:
inspector.close()