本文介绍了确定你在python循环中的迭代的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
基本上,我想知道什么时候在循环迭代中的第N个项目。
任何想法?
Basically I would like to be able to tell when I'm on the Nth item in a loop iteration.Any thoughts?
d = {1:2, 3:4, 5:6, 7:8, 9:0}
for x in d:
if last item: # <-- this line is psuedo code
print "last item :", x
else:
print x
推荐答案
a href =http://docs.python.org/library/functions.html?highlight=enumerate#enumerate =noreferrer> 枚举
:
Use enumerate
:
#!/usr/bin/env python
d = {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) - 1
for 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
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