字典(dict) 詳解 及 代碼

本文地址:?http://blog.csdn.net/caroline_wendy/article/details/17291329

字典(dict)是表示映射的數據結構,key-value形式, key必須是唯一的;

items()方法, 返回字典的所有項;

可以通過for循環去遍歷字典的鍵(key)和值(value), 也可以使用if判斷元素是否存在;

可以通過len()求字典的長度;下標操作符("[]")增加和刪除元素;

代碼:

# -*- coding: utf-8 -*-

#====================

#File: abop.py

#Author: Wendy

#Date: 2013-12-03

#====================

#eclipse pydev, python3.3

#字典, 即map, dict

an = { 'Caroline' : 'A beautiful girl.',

'Wendy' : 'A talent girl.',

'Spike' : 'A good boy'

}

print (an)

print ("Who is Caroline?", an['Caroline'])

del an['Spike']

print('There are {0} girls.'.format(len(an)))

for name, property in an.items() : #遍歷字典的項

print('{0} is that {1}'.format(name, property))

an['Ruby'] = 'A pretty girl'

if 'Ruby' in an : #判斷元素是否存在

print("The new one Ruby is that", an['Ruby'])

輸出:

{'Caroline': 'A beautiful girl.', 'Wendy': 'A talent girl.', 'Spike': 'A good boy'}

Who is Caroline? A beautiful girl.

There are 2 girls.

Caroline is that A beautiful girl.

Wendy is that A talent girl.

The new one Ruby is that A pretty girl

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