通过多态性。如何通过调用基类方法获得预期的响应？

Question

我有以下代码：

class Class1(object):

    def say_my_name(self):
        super(self.__class__, self).__init__()
        print 'I am a class1'

    def how_are_you(self):
        print 'how are you from class1'
        self.say_my_name()


class Class2(Class1):

    def say_my_name(self):
        super(self.__class__, self).__init__()
        print 'I am a class2'

    def how_are_you(self):
        print 'how are you from class2'
        self.say_my_name()

# all right
c1 = Class1()
c2 = Class2()
c1.how_are_you()
c2.how_are_you()

# attempt one. I expect 'I am a class1' but I get 'I am a class2'
c3 = super(Class2, c2)
c3.how_are_you() # 

# attempt two. I expect 'I am a class1' but I get 'I am a class2'
Class1.how_are_you(c2)

正如您在我的测试代码中看到的那样。

我期望通过多态获得对基类的引用，方法how_are_you()的调用返回我是class1 ，但我得到我是class2

我做错了什么？

EDIT 12/06/2016 15:47

更现实的例子

class Sheet(object):

    def mergeArrayInColumns(self, startRow, startColumn, dimRows, dimColumns, separator=None):
        # bla, bla, bla...
        return True

    def mergeColumns(self, startColumn, columns, separator=None):
        self.mergeArrayInColumns(0, startColumn, self.rowCount(), columns, separator)


class CommandMergeColumns(QUndoSelectionCommand):

    def __init__(self, sheet, startRow, rows, separator, undoSelection, redoSelection):
        description = 'merge {} rows at [{},:]'.format(rows, startRow)
        super(CommandMergeColumns, self).__init__(description, undoSelection, redoSelection)
        # get a base class?!
        self.sheet = super(CommandSheet, sheet)
        self.startRow = startRow
        self.rows = rows
        self.separator = separator

    def redo(self):
        self.redoArray = self.sheet.getArray(self.startRow, 0, self.rows, self.sheet.columnCount())
        # the problem it's here
        self.sheet.mergeColumns(self.startRow, self.rows, self.separator)
        # with this work but I do not like solution 
        #self.sheet.mergeArrayInColumns(self.startRow,
        #                            0,
        #                            self.rows,
        #                            self.sheet.columnCount(),
        #                            self.separator)

    def undo(self):
        self.sheet.removeColumns(self.startRow, 1)
        self.sheet.insertColumns(self.startRow, self.redoArray)


class CommandSheet(QObject, Sheet):

    def mergeColumns(self, startColumn, columns, separator, undoSelection, redoSelection):
        command = CommandMergeColumns(self, startColumn, columns, separator, undoSelection, redoSelection)
        self.stack.push(command)

# and finally I call mergeColumns method...
document = CommandSheet()
document.mergeColumns(startColumn, count, None, undoSelection, redoSelection)