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

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>>> 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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# Filename: backup_ver1.py
import os
import time
source=[r'C:\test', r'C:\test1']
target_dir='D:\\back\\'
target=target_dir+time.strftime('%Y%m%d%H%M%S')+'.zip'
zip_command=" ......
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