python字典

基于键值映射，

 

user1 = {};

user1['name'] = 'woxiaoe'

user1['city'] = 'cs'

user1['age'] = 1

print user1

 

user2 = {};

user2['name'] = 'yiba'

user2['city'] = 'cs'

user2['age'] = 1

mail = {'from':user1,'to':user2,'content':'hello world','file':['api.chm']}

print mail

print 'mail[content]\t' +  mail['content']

print 'from user name\t' +  mail['from']['name']

mail['file'].append('python.doc');

print mail

 

#dictionary sort

a = {'a':1,'b':2,'c':3}

print 'before sort:'

print  a

print "a.keys(): " 

print a.keys()

k = a.keys();

k.sort();

print "a.keys().sort():"

print k

print 'sorted(a):' 

print  sorted(a)

for key in sorted(a):

    print a[key]

 

output

{'city': 'cs', 'age': 1, 'name': 'woxiaoe'}

{'content': 'hello world', 'to': {'city': 'cs', 'age': 1, 'name': 'yiba'}, 'from': {'city': 'cs', 'age': 1, 'name': 'woxiaoe'}, 'file': ['api.chm']}

mail[content] hello world

from user name woxiaoe

{'content': 'hello world', 'to': {'city': 'cs', 'age': 1, 'name': 'yiba'}, 'from': {'city': 'cs', 'age': 1, 'name': 'woxiaoe'}, 'file': ['api.chm', 'python.doc']}

before sort:

{'a': 1, 'c': 3, 'b': 2}

a.keys(): 

['a', 'c', 'b']

a.keys().sort():

['a', 'b', 'c']

sorted(a):

['a', 'b', 'c']

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