Hi, everyone, I am a newbie for the python, right now I am doing a small program to read and write the xlsx file. I have refered some codes, and it is seems like I have some problems to deal with the data in this program.

我想求教一下，关于数据嵌套的问题，我是新手

    # -*- coding: utf-8 -*- 
import xdrlib,sys
import xlrd
import xlwt
def open_excel(file= 'incomingtry.xlsx'):
    try:
        data = xlrd.open_workbook(file)
        return data
    except Exception,e:
        print str(e)
def excel_table_byindex(file= 'incomingtry.xlsx',colnameindex=0,by_index=0):
    data = open_excel(file)
    table = data.sheets()[by_index]
    nrows = table.nrows 
    ncols = table.ncols 
    colnames =  table.row_values(colnameindex)
    list =[]
    for rownum in range(1,nrows):
row = table.row_values(rownum)
    if row:
             app = {}
             for i in range(len(colnames)):
                app[colnames[i]] = row[i] 
             list.append(app)
    return list
def excel_table_byname(file='incomingtry.xlsx',colnameindex=0,by_name=u'Sheet1'):
    data = open_excel(file)
    table = data.sheet_by_name(by_name)
    nrows = table.nrows 
    colnames =  table.row_values(colnameindex) 
    list =[]
    for rownum in range(1,nrows):
         row = table.row_values(rownum)
         if row:
             app = {}
             for i in range(len(colnames)):
                app[colnames[i]] = row[i]
             list.append(app)
    return list
def creat_the_newfile():
    wbk = xlwt.Workbook()
    sheet = wbk.add_sheet('sheet 1')
def main():
    tables = excel_table_byindex()
    #print tables
    for row in tables:
        print row
    #print "%d",row['order'];
    #for i in range(len(tables)):
    #    print row{i}
    print 'I have',len(tables)
    print 'The 3rd row ist',tables[2]
    Total_rownum=len(row)
    print 'The lenght of row ist',Total_rownum
if __name__=="__main__":
    main()

我看到了，这个tables是个list，而row则是dict，正确么？现在我如何访问或者操作list tables中row的每一个元素呢？
谢谢帮助
for this code, in the final step, I noticed that the tables is a list, but the row is dict embeded in the tables, so my question is, how can I visit the elements in all row and operate them?

thanks for your helping!