将 NaN 替换成某一数值

使用 fillna

dataframe.fillna(value = 'xxx',inplace=True)

删除某一个值

使用 drop

dataframe.drop(10,inplace=True)

交换两行的值

    if m != n:

        temp = np.copy(dataframe[m])

        dataframe[m] = dataframe[n]

        dataframe[n] = temp

    else:

        temp = np.copy(dataframe[dataframe.shape[1]-1])

        dataframe[dataframe.shape[1]-1] = dataframe[n]

        dataframe[n] = temp

删除 columns 这些列

    dataframe.drop(columns = list, inplace=True)