print(type(nuke.Panel))
print(dir(nuke.Panel))
# <type 'type'>
# ['__class__', '__delattr__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'addBooleanCheckBox', 'addButton', 'addClipnameSearch', 'addEnumerationPulldown', 'addExpressionInput', 'addFilenameSearch', 'addMultilineTextInput', 'addNotepad', 'addPasswordInput', 'addRGBColorChip', 'addScriptCommand', 'addSingleLineInput', 'addTextFontPulldown', 'clear', 'execute', 'setTitle', 'setWidth', 'show', 'title', 'value', 'width']