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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def resizeColumnsToContents(self, startCol=None, stopCol=None):
 """ Resizes all columns to the contents """

        numCols = self.model().columnCount()
        startCol = 0 if startCol is None else max(startCol, 0)
        stopCol  = numCols if stopCol is None else min(stopCol, numCols)

        row = 0
        for col in range(startCol, stopCol):
            indexWidget = self.indexWidget(self.model().index(row, col))

            if indexWidget:
                contentsWidth = indexWidget.sizeHint().width()
            else:
                contentsWidth = self.header().sectionSizeHint(col)

            self.header().resizeSection(col, contentsWidth)