zoukankan      html  css  js  c++  java
  • python dictionary

    //test.py

    dict = {1:1, 2:2, 3:3}
    print dict
    del dict[2]
    print dict
    dict.clear()
    print dict
    del dict
    print dict

    dict1 = {1:1, 1:2}
    print dict1

    dict3 = {(1, 2, 3): 4}
    print dict3[(1, 2,3)]
    print str(dict3)
    print type(dict3)
    dict3.clear()
    print dict3
    dict3['school'] = 'brand'
    print dict3.copy()
    ch = (1, 2, 3)
    chdict = {}
    print 'fromkeys',chdict.fromkeys(ch, 1)
    chdict = chdict.fromkeys(ch, 1)
    print chdict.get(1)
    print chdict.get(2)
    print chdict.get(3)
    print chdict.get(4)
    print chdict.has_key(3)
    print 'dict3.has_key',dict3.has_key((1, 2, 3))
    print dict3.has_key('school')
    print dict1.has_key(1)
    print chdict
    print chdict.items()
    print chdict.keys()
    chdict.setdefault(1, 100)
    print chdict
    chdict.setdefault(4, 2000)
    print chdict
    chdict.setdefault(5)
    print chdict
    di1 = {1:1,2:2}
    di2 = {3:3,4:4}
    di1.update(di2)
    print di1
    print chdict.values()
    print chdict.pop(5)
    print chdict
    print chdict.popitem()

    print chdict

    //result

    # python test.py
    {1: 1, 2: 2, 3: 3}
    {1: 1, 3: 3}
    {}
    <type 'dict'>
    {1: 2}
    4
    {(1, 2, 3): 4}
    <type 'dict'>
    {}
    {'school': 'brand'}
    fromkeys {1: 1, 2: 1, 3: 1}
    1
    1
    1
    None
    True
    dict3.has_key False
    True
    True
    {1: 1, 2: 1, 3: 1}
    [(1, 1), (2, 1), (3, 1)]
    [1, 2, 3]
    {1: 1, 2: 1, 3: 1}
    {1: 1, 2: 1, 3: 1, 4: 2000}
    {1: 1, 2: 1, 3: 1, 4: 2000, 5: None}
    {1: 1, 2: 2, 3: 3, 4: 4}
    [1, 1, 1, 2000, None]
    None
    {1: 1, 2: 1, 3: 1, 4: 2000}
    (1, 1)
    {2: 1, 3: 1, 4: 2000}

  • 相关阅读:
    5-1
    浅谈sql中的in与not in,exists与not exists的区别
    理解SQL SERVER中的分区表
    SQLSERVER SQL性能优化
    SQL Server Profiler使用方法
    SQL Server中的三种Join方式
    执行计划
    执行计划sql
    INSERT INTO SELECT
    设计模式学习笔记-单例模式
  • 原文地址:https://www.cnblogs.com/woodzcl/p/7793396.html
Copyright © 2011-2022 走看看