docs: def cols_strip(df,col_list, dest = False):
      """ Performs str.strip() a column of a DataFrame
      Parameters:
      df - DataFrame
          DataFrame to operate on
      col_list - list of strings
          names of columns to strip
      dest - bool, default False
          Whether to apply the result to the DataFrame or return it.
          True is apply, False is return.
      """
      if not dest:
          return _pd.DataFrame({col_name:col_strip(df,col_name) for col_name in col_list})
      for col_name in col_list:
          col_strip(df,col_name,dest)