'Gets the column (i.e. index into the line) for the given index into the
original string.
Arguments:
index: The index into the original string.
Returns:
The column (i.e. index into the line) for the given index into the
original string.'

def index_to_column_number(self, index):

    start_index = self.index_to_line_start_index(index)
    column = ((index - start_index) + 1)
    return column
