利用xlwt库，将文件传输日志中的数据统计到表格中，生成易观测的折线图。

```python
import xlwt
import os

def set_style(name,height,bold=False):
    style = xlwt.XFStyle()
    font = xlwt.Font()
    font.name = name
    font.bold = bold
    font.color_index = 4
    font.height = height
    style.font = font
    return style
def write_excel():
    filename = "/mnt/put_1.log"
    f = xlwt.Workbook()
    colum0 = []
    colum1 = []
    temp = []
    sheet1 = f.add_sheet("auto-excel",cell_overwrite_ok = True)
    row0 = ["time(s)","speed(kbyte/s)"]
    f1 = open(filename)
    line = f1.readline()
    while line:
        temp = line.split(',')
        colum0.append(temp[0])
        colum1.append(temp[1])
        line = f1.readline()
    f1.close()
    for i in range(0,len(row0)):
        sheet1.write(0,i,row0[i],set_style('Times New Roman',220,True))
    for i in range(0,len(colum0)):
        sheet1.write(i+1,0,colum0[i],set_style('Times New Roman',220,True))
    for i in range(0,len(colum1)):
        sheet1.write(i+1,1,colum0[i],set_style('Times New Roman',220,True)) 
    f.save('test.xls')
if _name_ == '_main_':
    write_excel()