test_list = []
dic1 = {}
test_list = [dic1 for _ in range(3)]
ll = [1, 2, 3]

for i in range(3):
    test_list[i]['value'] = ll[i]

print(test_list)

运行结果：每次赋值都更改了所有项

原因：python的二位数据创建方式就是这样，官方文档中有描述What has happened is that [[]] is a one-element list containing an empty list,
so all thr服务器托管网ee elements of [[]] * 3 are references to this single empty list.
Modifying any of the elements of lists modifies this single list. You can create a list of different lists this way:

>>> lists = [[] for i in range(3)]
>>> lists[0].append(3)
>>> lists[1].append(5)
>>> lists[2].append(7)
>>> lists
[[3], [5], [7]]

那么，将上述代码修改为：

test_list = []
test_list = [{} for _ in range(3)]
ll = [1, 2, 3]

for i in range(3):
    test_list[i]['value'] = ll[i]

print(test_list)

结果正确：

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test_list = []
dic1 = {}
test_list = [dic1 for _ in range(3)]
ll = [1, 2, 3]

for i in range(3):
    test_list[i]['value'] = ll[i]

print(test_list)

运行结果：每次赋值都更改了所有项

原因：python的二位数据创建方式就是这样，官方文档中有描述What has happened is that [[]] is a one-element list containing an empty list,
so all thr服务器托管网ee elements of [[]] * 3 are references to this single empty list.
Modifying any of the elements of lists modifies this single list. You can create a list of different lists this way:

>>> lists = [[] for i in range(3)]
>>> lists[0].append(3)
>>> lists[1].append(5)
>>> lists[2].append(7)
>>> lists
[[3], [5], [7]]

那么，将上述代码修改为：

test_list = []
test_list = [{} for _ in range(3)]
ll = [1, 2, 3]

for i in range(3):
    test_list[i]['value'] = ll[i]

print(test_list)

结果正确：

服务服务器托管网器托管，北京服务器托管，服务器租用 http://www.fwqtg.net

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产品描述 AP3471 是一款支持宽电压输入的同步降压电源管理芯片， 输入电压 8-30V 范围内可实现3.1A 的连续电流输出。通过调节 FB 端口的分压电阻， 设定输出 1.8V 到 28V 的稳 定电压 。AP3471 具有优秀的负载调整率和线电压调整率…