列表和字典嵌套

待我称王封你为后i 2023-10-02 08:54 42阅读 0赞

zd = {
        'shen': ['python','java','ruby'],
        'yuan': ['java'],
        'chen': ['c++'],
        'long': ['delphi'],
        'huge': ['ruby'],
      }
    
    for k,v in zd.items():     #同时遍历键和值用item方法， 同时 遍历 键 和 值
        print('\n'+k)
        for i in v:
            print(i)
    
    print('------------------------------------------------')
    
    for k in zd.keys():            #遍历字典所有的  键
        print(k)
    
    
    print('------------------------------------------------')
    
    for i in zd.values():           #遍历字典的   值
        print(i)
    
    print('+++++++++++')
    
    for i in zd:                   #遍历字典的   值
        print(zd[i])
    
    print('------------------------------------------------')
    
    print(zd.items())
    
    ssx = list(zd.items())
    
    print(ssx[0])
    print(ssx[1])
    
    print('+++++++++++++++++++++++++')
    
    for i in ssx:
        print(i)
    
    
    print('------------------------------------------------')
    
    print(zd.values())         #打印字典的值，为一个列表      返回一个值的列表而不包含任何键
    
    sx = list(zd.values())      #list使之成为一个列表
    
    print(sx)
    
    print('+++++++++++++++')
    
    print(sx[0])
    
    print('------------------------------------------------')
    
    print(zd.keys())    #返回一个所有键的列表    即返还的是一个列表，包含所有键
    
    cp = []
    
    cp = zd.keys()
    
    for i in cp:
        print(i)
    
    
    ==========================================================================
    ==========================================================================
    ==========================================================================
    ==========================================================================
    
    
    
    执行结果：
    
    
    shen
    python
    java
    ruby
    
    yuan
    java
    
    chen
    c++
    
    long
    delphi
    
    huge
    ruby
    
    ------------------------------------------------
    
    shen
    yuan
    chen
    long
    huge
    
    ------------------------------------------------
    
    ['python', 'java', 'ruby']
    ['java']
    ['c++']
    ['delphi']
    ['ruby']
    
    +++++++++++
    
    ['python', 'java', 'ruby']
    ['java']
    ['c++']
    ['delphi']
    ['ruby']
    
    ------------------------------------------------
    
    dict_items([('shen', ['python', 'java', 'ruby']), ('yuan', ['java']), ('chen', ['c++']), ('long', ['delphi']), ('huge', ['ruby'])])
    ('shen', ['python', 'java', 'ruby'])
    ('yuan', ['java'])
    
    +++++++++++++++++++++++++
    
    ('shen', ['python', 'java', 'ruby'])
    ('yuan', ['java'])
    ('chen', ['c++'])
    ('long', ['delphi'])
    ('huge', ['ruby'])
    
    ------------------------------------------------
    
    dict_values([['python', 'java', 'ruby'], ['java'], ['c++'], ['delphi'], ['ruby']])
    [['python', 'java', 'ruby'], ['java'], ['c++'], ['delphi'], ['ruby']]
    
    +++++++++++++++
    
    ['python', 'java', 'ruby']
    
    ------------------------------------------------
    
    dict_keys(['shen', 'yuan', 'chen', 'long', 'huge'])
    shen
    yuan
    chen
    long
    huge
    
    ==========================================================================
    ==========================================================================
    ==========================================================================
    ==========================================================================
    
    
    
    list1 = ['key1','key2','key3']
    
    list2 = ['1','2','3']                #用zip函数合并
    
    
    lb = list(zip(list1,list2))                #返回列表
    
    print(lb)
    
    #----------------------------------------------------
    
    zd = {}
    
    zd = dict(zip(list1,list2))        #返回字典
    
    print(zd)
    
    +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    
    执行结果：
    
    [('key1', '1'), ('key2', '2'), ('key3', '3')]
    
    
    {
         'key1': '1', 'key2': '2', 'key3': '3'}
    
    
    ============================================================================
    ==============================================================================
    
    ===============================================================================
    
    
    将列表转换为字典：
    
    
    new_list= [['key1','value1'],['key2','value2'],['key3','value3']]
    
    zd = {}
    
    zd  = dict(new_list)
    
    print(zd)
    
    
    执行结果：
    
    
    {
         'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}
    
    
    =================================================================================
    
    方法二：
    
    
    new_list= [['key1','value1'],['key2','value2'],['key3','value3']]
    
    new_dict = {}
    
    for i in new_list:
        print(i)               #  i 为 ：['key1','value1']
        new_dict[i[0]] = i[1]   # i[1]为 ：value1                 左边key  右边value
        
                              #i[0] 为：  key1
    # new_dict[key1] = value1    #为增加k、v值
    
    print(new_dict)
    
    
    执行结果：
    
    
    ['key1', 'value1']
    ['key2', 'value2']
    ['key3', 'value3']
    {
         'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}