Python 中遍历序列中元素和下标

enumerate 函数用于遍历序列中的元素以及它们的下标

for  i,v in  enumerate(['tic','tac','toe']):
    print  i,v

#0 tic
#1 tac
#2 toe

for i,j in enumerate(('a','b','c')):
    print i,j

#0 a
#1 b
#2 c

for i,j in enumerate({'a':1,'b':2}):
    print i,j

#0 a
#1 b

遍历字典的key和value

knights={'galahad':'the pure','robin':'the brave'}
for  k,v  in  knights.iteritems():
    print  k,v 

#galahad the pure
#robin the brave