您可以使用select：

// df := dataframe.ReadCSV(/*your io variable*/)
   // I use this example
   df := dataframe.LoadRecords(
        [][]string{
            []string{"A", "B", "C", "D"},
            []string{"a", "4", "5.1", "true"},
            []string{"k", "5", "7.0", "true"},
            []string{"k", "4", "6.0", "true"},
            []string{"a", "2", "7.1", "false"},
        },
    )

    fmt.Println("Original dataframe:")
    fmt.Println(df)
    
    // only select A, B, C
    // and update df
    df = df.Select([]int{0, 1, 2}) // []string{"A", "B", "C",}

    fmt.Println("Updated dataframe:")
    fmt.Println(df)

注意：如果可以的话，不要使用这个包，因为这个包不支持！
Github repo是这样说的：This is an implementation of DataFrames, Series and data wrangling methods for the Go programming language. The API is still in flux so use at your own risk.
更好的方法是在python中使用pandas！