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class konten(QtGui.QDialog):
    def  __init__(self, *args):
        QtGui.QDialog.__init__(self, *args)
        uic.loadUi("gui/bh_konten.ui",self)


        self.tbl_konten.horizontalHeader().resizeSection(0,0) # Id
        self.tbl_konten.horizontalHeader().resizeSection(1,450) # Kontoname
        self.tbl_konten.horizontalHeader().resizeSection(2,350) # Iban
        self.tbl_konten.horizontalHeader().resizeSection(3,200) # Bic
        self.tbl_konten.horizontalHeader().resizeSection(4,160) # Kontostand
        self.btn_neu.clicked.connect(self.konto_neu)

        self.konto_fuellen()
        
    def konto_fuellen(self):
        SQL_Statement="SELECT id,bezeichnung,iban,bic,kontostand FROM bh_konten ORDER BY iban;"
        SQL_Result=db.DBConnect(SQL_Statement)
        self.tbl_konten.setRowCount(len(SQL_Result))
        Zeile=0
        Guthaben=0
        for ROW in SQL_Result:
            self.tbl_konten.setItem(Zeile,0,QtGui.QTableWidgetItem(str(ROW[0]))) # ID
            self.tbl_konten.setItem(Zeile,1,QtGui.QTableWidgetItem(str(ROW[1]))) # Bezeichnung
            self.tbl_konten.setItem(Zeile,2,QtGui.QTableWidgetItem(str(ROW[2]))) # Iban
            self.tbl_konten.setItem(Zeile,3,QtGui.QTableWidgetItem(str(ROW[3]))) # BIC
            self.tbl_konten.setItem(Zeile,4,QtGui.QTableWidgetItem(str(ROW[4]))) # Kontostand
            self.tbl_konten.item(Zeile,4).setTextAlignment(QtCore.Qt.AlignRight + QtCore.Qt.AlignVCenter)
            Guthaben=Guthaben + float(ROW[4])
            Zeile=Zeile + 1
        self.lbl_gesamtsumme.setText("Gesamt Vermögen: " + str(Guthaben))
            
    def konto_neu(self):
        self.Window=konto_neu()
        self.Window.show()
        
class konto_neu(QtGui.QDialog):
    def __init__(self,*args):
        QtGui.QDialog.__init__(self, *args)
        uic.loadUi("gui/bh_konten_anlegen.ui",self)

        self.btn_anlegen.clicked.connect(self.anlegen)

    def anlegen(self):
        Kontoname=self.txt_kontoname.text()
        Iban=self.txt_iban.text()
        Bic=self.txt_bic.text()
        Guthaben=self.txt_guthaben.text()

        SQL_Statement="INSERT INTO bh_konten (bezeichnung,iban,bic,kontostand) VALUES ('%s','%s','%s',%10.2lf);" %(str(Kontoname),str(Iban),str(Bic),float(Guthaben))
        Result=db.DBConnect(SQL_Statement)

        self.close()

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>>> new = konto_neu()
>>> new.anlegen()

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konten.konto_fuellen()

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new=konten()
new.konto_fuellen()

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class AnyClass(object):
    def __init__(self, foo):
        self.foo = foo

    def do_something(self):
        return tuple(self.foo)

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>>> AnyClass.do_something()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unbound method do_something() must be called with AnyClass instance as first argument (got nothing instead)
>>> any_instance = AnyClass('blubber')
>>> any_instance.do_something()
('b', 'l', 'u', 'b', 'b', 'e', 'r')