class Layer:
    def __init__(self, name=u"Слой", type=0, thickness=100, color=QColor(Qt.darkBlue), maskType=0, visibility=True):
        self.mask = []                # список полигонов
        self.name = name              # u"Слой"
        self.type = type              # 0 - напыление, 1 - травление, 2 - диффузия
        self.thickness = thickness    # 100
        self.color = color            # Qt.darkBlue
        self.maskType = maskType      # 0 - позитивная, 1 - негативная
        self.visibility = visibility  # True

Traceback (most recent call last):
  File "/home/soifong/workspace/xnano/src/ProjectManager.py", line 24, in saveProject
    self.saveProjectAs()
  File "/home/soifong/workspace/xnano/src/ProjectManager.py", line 31, in saveProjectAs
    self.saveProject()
  File "/home/soifong/workspace/xnano/src/ProjectManager.py", line 26, in saveProject
    pickle.dump(self.parent.structure, self.filename)
  File "/usr/lib/python2.5/pickle.py", line 1362, in dump
    Pickler(file, protocol).dump(obj)
  File "/usr/lib/python2.5/pickle.py", line 203, in __init__
    self.write = file.write
AttributeError: 'QString' object has no attribute 'write'

pickle.dump(self.parent.structure, open(self.filename, 'wb'))