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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 getcolshapestring(self, columnname, startrow=0, nrow=-1, rowincr=1):
 """Get the shapes of all cells in the column in string format. It returns the shape in a string like [10,20,30]. If the column contains fixed shape arrays, a single shape is returned. Otherwise a list of shape strings is returned. The column can be sliced by giving a start row (default 0), number of rows (default all), and row stride (default 1). """

        return self._getcolshapestring(columnname,
                                       startrow, nrow, rowincr,
                                       True)