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class Form(QDialog):
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  amountLabel = QLabel("Amount")
  self.amountLabel = QLabel()
  ........

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Python code:

>>> class T(object):
... def __init__(self):
... val = 1
... self.val = 2
... print id(val)
... print id(self.val)
...
>>> t = T()
135716664
135716652
>>> print id(t.val)
135716652





...
  amountLabel = QLabel("Amount")
  self.amountLabel = QLabel()

  layout.addWidget( amountLabel)
  layout.addWidget(self.amountLabel)
...

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code:
remote = urllib.urlopen(remote_file)
local_file = open(local_path_name, "wb")
local_file.write(remote.read())
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