old_contents: from __future__ import absolute_import, division, print_function, unicode_literals
  from PySide import QtGui
  
  
  def _Box(box, *a):
      for arg in a:
          if isinstance(arg, tuple):
              item = arg[0]
          else:
              item = arg
              arg = (item,)
  
          if isinstance(item, QtGui.QLayout):
              box.addLayout(*arg)
          if isinstance(item, QtGui.QWidget):
              box.addWidget(*arg)
          if item is None:
              box.addStretch()
  
      return box
  
  def Row(*a, **kw):
      """
      :rtype: QHBoxLayout
      """
      margin = kw.pop('margin', None)
      box = QtGui.QHBoxLayout(**kw)
      if margin:
          box.setContentsMargins((margin,) * 4)
      _Box(box, *a)
      return box
  
  
  def Column(*a, **kw):
      """
      :rtype: QtGui.QVBoxLayout
      """
      margin = kw.pop('margin', None)
      box = QtGui.QVBoxLayout(**kw)
      if margin:
          box.setContentsMargins((margin,) * 4)
      _Box(box, *a)
      return box
  
  def setWidgetError(widget, exc):
      """
      Add a subwidget to `widget` that displays the error message for the exception `exc`
      :param widget:
      :param exc:
      :return:
      """
      layout = QtGui.QVBoxLayout()
      layout.addWidget(QtGui.QLabel(exc.message))
      layout.addStretch()
      widget.setLayout(layout)
  
new_contents: from __future__ import absolute_import, division, print_function, unicode_literals
  from PySide import QtGui
  
  
  def _Box(box, *a):
      for arg in a:
          if isinstance(arg, tuple):
              item = arg[0]
          else:
              item = arg
              arg = (item,)
  
          if isinstance(item, QtGui.QLayout):
              box.addLayout(*arg)
          if isinstance(item, QtGui.QWidget):
              box.addWidget(*arg)
          if item is None:
              box.addStretch()
  
      return box
  
  def Row(*a, **kw):
      """
      :rtype: QtGui.QHBoxLayout
      """
      margin = kw.pop('margin', None)
      box = QtGui.QHBoxLayout(**kw)
      _Box(box, *a)
      if margin is not None:
          box.setContentsMargins(margin, margin, margin, margin)
      return box
  
  
  def Column(*a, **kw):
      """
      :rtype: QtGui.QVBoxLayout
      """
      margin = kw.pop('margin', None)
      box = QtGui.QVBoxLayout(**kw)
      _Box(box, *a)
      if margin is not None:
          box.setContentsMargins(margin, margin, margin, margin)
      return box
  
  def setWidgetError(widget, exc):
      """
      Add a subwidget to `widget` that displays the error message for the exception `exc`
      :param widget:
      :param exc:
      :return:
      """
      layout = QtGui.QVBoxLayout()
      layout.addWidget(QtGui.QLabel(exc.message))
      layout.addStretch()
      widget.setLayout(layout)
  
subject: Check margin keyword to Row/Column is not None