读取excel文件并绘制图表[Python]

import matplotlib.pyplot as plt
import numpy as np
import xlrd
import os
from StringIO import StringIO


if __name__ == '__main__':
    data = xlrd.open_workbook('D:\\tt.xls')

    plt.figure(figsize=(8,4))
    plt.xlabel(u'second')
    plt.ylabel(u'xxx')


    x_index=1

    data.sheet_names()
    table = data.sheets()[0]
    table = data.sheet_by_index(0)
    table = data.sheet_by_name(u'Sheet1')
    print("Good")
    COLOR_INDEX=1
    INDEX_NAME=''

    ## init data


    nrows = table.nrows
    ncols = table.ncols
    print("nr=%d  nc=%d  \n"%(nrows,ncols))

    '''
    for rownum in range(table.nrows):
            value = table.cell(rownum,2).value
            if rownum == 0:
                print("")
            else:
                try:
                    value_int =  int(value)
                    x.append(x_index)
                    y.append(value_int)
                   # line = ax.plot(x_index,value_int,label="xx ",color="red",linewidth=2)
                    #plt.plot(x_index,value_int,label="xx ",color="red",linewidth=2)
                    print("index=%d"%x_index)

                    #plt.plot_date(x_index,value_int)
                    x_index=x_index+1
                except:
                    print("error")
    plt.plot(x,y,label="xx ",color="red",linewidth=2)
    '''
    for colnum in range(table.ncols):
        x=[]
        y=[]
        for rownum in range(table.nrows):
            value = table.cell(rownum,colnum).value
            #print("nr=%d  nc=%d value=%d   \n"%(rownum,colnum,value ))
            #print(value)
            #print("rownum=%d  colnum=%d  "%(rownum,colnum))
            if rownum == 0:
                print("")
            else:
                try:
                    value_int =  int(value)
                    x.append(x_index)
                    y.append(value_int)
                    #plt.plot(x_index,value_int,label=" ",color="red",linewidth=2)
                    #print("index=%d"%x_index)

                    #plt.plot_date(x_index,value_int)
                    x_index=x_index+1
                except:
                    print("error")
        if COLOR_INDEX == 1:
            COLOR_INDEX = 0
            plt.plot(x,y,color="red",linewidth=2)
        else:
            COLOR_INDEX =1
            plt.plot(x,y,color="blue",linewidth=2)
        print("==============================>")

    plt.title("RTT Test")
    #plt.ylim(10,2000)
    plt.legend()
    plt.show()


    pass