python 高级特性：Iteration(迭代)

发布时间：2020-07-15 12:17:20 来源：网络阅读：455 作者：虎皮喵的喵栏目：编程语言

概念：可用于循环就是迭代

#!/usr/bin/python

dic = {'a':1, 'b':2, 'c':3, 'd':4};
for key in dic:
print "key:", key;

for value in dic.itervalues():
print "value:", value;

python 高级特性：Iteration(迭代)

for key in dic.iterkeys():
print "key:", key;

python 高级特性：Iteration(迭代)

for key in dic.keys():
print "keys:", key;

python 高级特性：Iteration(迭代)

for key,value in dic.iteritems():
print "iteritems:", key, value;

python 高级特性：Iteration(迭代)

#check 检查dic是否为可迭代类型
from collections import Iterable #申明Iterable
print isinstance(dic, Iterable);

python 高级特性：Iteration(迭代)

#enumerate
for x, y in enumerate(['a', 'b', 'c']):
print x, y

python 高级特性：Iteration(迭代)

for x,y in [(1, 2), (3, 4), (5, 6)]:
print x,y

python 高级特性：Iteration(迭代)

for x in [(1, 2), (3, 4), (5, 6)]:
print x

python 高级特性：Iteration(迭代)

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