为什么字典里的值变了以后，其他的值也都变了？

Question

为什么字典中指定索引中的一个值更改后，其他所有索引值也都更改了，为什么会发生这种情况？你知道吗

with open(BotAccountFile, 'r') as account_file:
        for num, line in enumerate(account_file, 1):
            username = line.split(',')[0].strip()
            BotAccountsLinksList[num] = {'UserName': username, 'Password': line.split(',')[1].strip(),
                                         'CompletedDownload': False}

    BotLinksList = {}
    BotLinksList['LinkData'] = {}
    with open(BotDownloadURIsFile, 'r') as link_file:
        for item in BotAccountsLinksList:
            for num, line in enumerate(link_file, 1):
                BotLinksList['LinkData'][num] = {'Link': line.strip(), 'CompletedDownload': False}
            BotAccountsLinksList[item].update(BotLinksList)

还有我的字典：

BotAccountsLinksList = {}

BotAccountsLinksList = {1: {'UserName': 'user1', 'Password': 'pass1',  
    'CompletedDownload': False, 'LinkData': {1: {'Link': 'www.yahoo.com',  
    'CompletedDownload': False}, 2: {'Link': 'www.google.com',  
    'CompletedDownload': False}}}, 2: {'UserName': 'user2', 'Password': 'pass2',  
    'CompletedDownload': False, 'LinkData': {1: {'Link': 'www.yahoo.com',  
    'CompletedDownload': False}, 2: {'Link': 'www.google.com',  
    'CompletedDownload': False}}}, 3: {'UserName': 'user3', 'Password': 'pass3',  
    'CompletedDownload': False, 'LinkData': {1: {'Link': 'www.yahoo.com',  
    'CompletedDownload': False}, 2: {'Link': 'www.google.com',  
    'CompletedDownload': False}}}, 3: {'UserName': 'user4', 'Password': 'pass4',  
    'CompletedDownload': False, 'LinkData': {1: {'Link': 'www.yahoo.com',  
    'CompletedDownload': False}, 2: {'Link': 'www.google.com',  
    'CompletedDownload': False}}}}

我用这个代码只改变索引1中的一个值：

BotAccountsLinksList[1]['LinkData'][1]['CompletedDownload'] = True # {'Link': 'www.yahoo.com', 'CompletedDownload': True}

但运行此代码后，其他索引值也发生了变化：

BotAccountsLinksList = {1: {'UserName': 'user1', 'Password': 'pass1',  
    'CompletedDownload': False, 'LinkData': {1: {'Link': 'www.yahoo.com',  
    'CompletedDownload': True}, 2: {'Link': 'www.google.com',  
    'CompletedDownload': False}}}, 2: {'UserName': 'user2', 'Password': 'pass2',  
    'CompletedDownload': False, 'LinkData': {1: {'Link': 'www.yahoo.com',  
    'CompletedDownload': True}, 2: {'Link': 'www.google.com',  
    'CompletedDownload': False}}}, 3: {'UserName': 'user3', 'Password': 'pass3',  
    'CompletedDownload': False, 'LinkData': {1: {'Link': 'www.yahoo.com',  
    'CompletedDownload': True}, 2: {'Link': 'www.google.com',  
    'CompletedDownload': False}}}, 3: {'UserName': 'user4', 'Password': 'pass4',  
    'CompletedDownload': False, 'LinkData': {1: {'Link': 'www.yahoo.com',  
    'CompletedDownload': True}, 2: {'Link': 'www.google.com',  
    'CompletedDownload': False}}}}

我在windows1064位上使用python3.8。

Answer 1

BotAccountsLinksList[item].update(BotLinksList)

他在做什么

for k,v in BotLinksList.items():
    BotAccountsLinksList[item][k] = v

BotLinksList值将在多个BotAccountsLinksList键之间共享。不要重复使用同一个dict多次或做一个deepcopy

import copy

BotAccountsLinksList[item].update(copy.deepcopy(BotLinksList))