字典|字典和数组嵌套|keys()|value()|item()|del

python 中没有i++！

 dic = {
     'a':5,
     'kelv':'ooo',
     5:2333,
     2333:'yoo'
     }
 print dic[dic[dic['a']]]
 print dic

 #yoo
 #{'a': 5, 'kelv': 'ooo', 5: 2333, 2333: 'yoo'}

 dic['sss']='ooooppppp'
 print dic
 #{'a': 5, 'kelv': 'ooo', 5: 2333, 'sss': 'ooooppppp', 2333: 'yoo'}

 step=0
 dic ['b']=5
 for key,value in sorted(dic.items()):
     print key,"\t",value
     step=step+1
 print "step is "+str(step)

 '''
 5       2333
 2333    yoo
 b       5
 a       5
 kelv    ooo
 sss     ooooppppp
 '''

 del dic['kelv']
 print dic

 #{'a': 5, 'b': 5, 5: 2333, 'sss': 'ooooppppp', 2333: 'yoo'}

 for k in set(dic.values()):
     print k

 '''
 5
 2333
 ooooppppp
 yoo
 '''

 new_1 = {'A':'asss','B':'bssss','C':'asss','D':'bssss'}
 new_2 = {'lll':'asss',123:'bssss','A':'asss','B':'bssss','C':'asss','D':'bssss'}
 new_3 = {'Appp':'asss','B':'bs'}
 arr = [new_1,new_2,new_3]
 for a in arr[:3]:
     a['A'] = ''
     a['D'] = 'lllllllll'
 print arr

 '''
 [{'A': '1234', 'C': 'asss', 'B': 'bssss', 'D': 'lllllllll'}, {'A': '1234', 'C': 'asss', 'B': 'bssss', 'D': 'lllllllll', 'lll': 'asss', 123: 'bssss'}, {'A': '1234', 'B': 'bs', 'D': 'lllllllll', 'Appp': 'asss'}]

 '''
 print arr[1].keys()
 print arr[1].items()
 #['A', 'C', 'B', 'D', 'lll', 123]
 #[('A', '1234'), ('C', 'asss'), ('B', 'bssss'), ('D', 'lllllllll'), ('lll', 'asss'), (123, 'bssss')]
 for a in arr:
     for k,v in a.items():
         print k,"\t",v

 '''
 A       1234
 C       asss
 B       bssss
 D       lllllllll
 A       1234
 C       asss
 B       bssss
 D       lllllllll
 lll     asss
 123     bssss
 A       1234
 B       bs
 D       lllllllll
 Appp    asss
 '''
 new_4={'kkkkk':{'opoppo':123}}
 arr.append(new_4)
 for value in arr[3].values():
     for key2 in value:
         print key2
 #opoppo