确定您在python循环中正在进行的迭代

用途

enumerate

#!/usr/bin/env pythond = {1:2, 3:4, 5:6, 7:8, 9:0}# If you want an ordered dictionary (and have python 2.7/3.2), # uncomment the next lines:# from collections import OrderedDict# d = OrderedDict(sorted(d.items(), key=lambda t: t[0]))last = len(d) - 1for i, x in enumerate(d):    if i == last:        print i, x, 'last'    else:        print i, x# Output:# 0 1# 1 3# 2 9# 3 5# 4 7 last