python关联数组的应用

某网友的一个问题，想用awk对一个文件进行处理，可是没有思路 

Release  SPA          Problem   owner

289      DROUTER   cr_123    jiji

2810     DROUTER   cr_1234    qiqi

289      EPAY        cr_234    zhaon

289      DROUTER   cr_12345   qiqi

结果 ：

Release : 289

SPA: DROUTER

cr_123    jiji

cr_234    zhaon

SPA:EPAY

cr_12345   qiqi

Release: 2810 

SPA:DROUTER

cr_1234    qiqi

 

下面的是我的python的代码

#!/usr/bin/python
FD = open("/root/data","r")
R = {}
firline = FD.readline()

for line in FD.readlines():
    tmp=line.split()
    if tmp[0] in R:
        if tmp[1] in R[tmp[0]]:
            R[tmp[0]][tmp[1]][tmp[3]]=tmp[2]
        else :
            R[tmp[0]][tmp[1]]={}
            R[tmp[0]][tmp[1]][tmp[3]]=tmp[2]
    else:
        R[tmp[0]]={}
        R[tmp[0]][tmp[1]]={}
        R[tmp[0]][tmp[1]][tmp[3]]=tmp[2]

for release in R.keys():
    print "Release: " + release
    for spa in R[release].keys():
        print "\tSPA: " + spa
        for own in R[release][spa].keys():
            print "\t\t" + R[release][spa][own] + "\t" + own