<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def delete_cols(self, col, no_cols=1):
 """Deletes no_cols column and marks grid as changed"""


        # Mark content as changed
        post_command_event(self.main_window, self.ContentChangedMsg)

        tab = self.grid.current_table

        try:
            self.code_array.delete(col, no_cols, axis=1, tab=tab)

        except ValueError, err:
            post_command_event(self.main_window, self.StatusBarMsg,
                               text=err.message)