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Python實(shí)現(xiàn)列表轉(zhuǎn)換成字典數(shù)據(jù)結(jié)構(gòu)的方法

更新時(shí)間：2016年03月11日 10:33:58 作者：Ruthless

這篇文章主要介紹了Python實(shí)現(xiàn)列表轉(zhuǎn)換成字典數(shù)據(jù)結(jié)構(gòu)的方法,結(jié)合實(shí)例形式分析了Python數(shù)值類(lèi)型轉(zhuǎn)換的相關(guān)技巧,需要的朋友可以參考下

本文實(shí)例講述了Python實(shí)現(xiàn)列表轉(zhuǎn)換成字典數(shù)據(jù)結(jié)構(gòu)的方法。分享給大家供大家參考，具體如下：

'''
[
  {'symbol': 101, 'sort': 1, 'name': 'aaaa'},
  {'symbol': 102, 'sort': 2, 'name': 'bbbb'},
  {'symbol': 103, 'sort': 3, 'name': 'cccc'},
  {'symbol': 104, 'sort': 4, 'name': 'dddd'},
  {'symbol': 105, 'sort': 5, 'name': 'eeee'},
  {'symbol': 106, 'sort': 6, 'name': 'ffff'},
  {'symbol': 107, 'sort': 7, 'name': 'gggg'},
  {'symbol': 108, 'sort': 8, 'name': 'hhhh'},
  {'symbol': 109, 'sort': 9, 'name': 'iiii'}
]
轉(zhuǎn)換成如下的結(jié)構(gòu)，便于通過(guò)ID獲取記錄值
{
  101: {'sort': 1, 'symbol': 101, 'name': 'aaaa'},
  102: {'sort': 2, 'symbol': 102, 'name': 'bbbb'},
  103: {'sort': 3, 'symbol': 103, 'name': 'cccc'},
  104: {'sort': 4, 'symbol': 104, 'name': 'dddd'},
  105: {'sort': 5, 'symbol': 105, 'name': 'eeee'},
  106: {'sort': 6, 'symbol': 106, 'name': 'ffff'},
  107: {'sort': 7, 'symbol': 107, 'name': 'gggg'},
  108: {'sort': 8, 'symbol': 108, 'name': 'hhhh'},
  109: {'sort': 9, 'symbol': 109, 'name': 'iiii'}
}
'''
students = [
    {'symbol': 101, 'sort': 1, 'name': 'aaaa'},
    {'symbol': 102, 'sort': 2, 'name': 'bbbb'},
    {'symbol': 103, 'sort': 3, 'name': 'cccc'},
    {'symbol': 104, 'sort': 4, 'name': 'dddd'},
    {'symbol': 105, 'sort': 5, 'name': 'eeee'},
    {'symbol': 106, 'sort': 6, 'name': 'ffff'},
    {'symbol': 107, 'sort': 7, 'name': 'gggg'},
    {'symbol': 108, 'sort': 8, 'name': 'hhhh'},
    {'symbol': 109, 'sort': 9, 'name': 'iiii'}
  ]
symbol_list = map(lambda x: (x.get('symbol'), x), students)
print symbol_list
print '-----------------------------------------'
print dict(symbol_list)
#value_list = map(lambda x: x, students)
#
##print dict(zip(symbol_list, value_list))
#
#
#student = {
#    101: {'symbol': 101, 'sort': 1, 'name': 'aaaa'}
#    }
#
#student = [
#    {101: {'symbol': 101, 'sort': 1, 'name': 'aaaa'}}
#    ]
#

排序用法：

students = [
      {'name':'zhangsan', 'price':20.01, 'date':'2015-01-09T01:00:00Z'},
      {'name':'lisi', 'price':10.01, 'date':'2013-01-09T01:00:00Z'},
      {'name':'wangwu', 'price':0.01, 'date':'2012-01-09T01:00:00Z'}
] 
print sorted(students, key=lambda s:s["name"])
print sorted(students, key=lambda s:s["price"], reverse=True)
print sorted(students, key=lambda s:s["date"], reverse=True)
aa = sorted(students, key=lambda s:s["price"], reverse=True)
sorted(aa, key=lambda s:s["date"], reverse=True)
symbol_arr = [<Symbol: Symbol object>, <Symbol: Symbol object>, <Symbol: Symbol object>] 
sorted(symbol_arr, key=lambda s:s.amount, reverse=True)

希望本文所述對(duì)大家Python程序設(shè)計(jì)有所幫助。

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