将值添加到 defaultdict 设置中断 128
[英]adding values to defaultdict set breaking on 128
问题描述
Something always breaks once my address reaches value 128, and it stops putting the new value at the end of the nested dict.
一旦我的地址达到值 128，总是会出现问题，并且它会停止将新值放在嵌套字典的末尾。 And instead starts ordering it from the beginning again.而是重新从头开始订购。 Why is it doing this?为什么要这样做？
result.setdefault(fan_definitions_name, set()).add(int(address))
The structure of the data I'm looping through looks like this ->我循环的数据结构看起来像这样->
list_address_of_selected_fans = [[101, 'standard fan definition1', 'JVEC-SP'],[102, 'standard fan definition1', 'JVEC-SP']]
EDIT: here is a runnable example where I provide the input.编辑：这是我提供输入的可运行示例。 You can run this example directly (I'm using python 3.8.2)您可以直接运行此示例（我使用的是 python 3.8.2）
list_address_of_selected_fans = [[101, 'standard fan definition1', 'JVEC-SP'],
[102, 'standard fan definition1', 'JVEC-SP'],
[103, 'standard fan definition1', 'JVEC-SP'],
[104, 'standard fan definition1', 'JVEC-SP'],
[105, 'standard fan definition1', 'JVEC-SP'],
[106, 'standard fan definition1', 'JVEC-SP'],
[107, 'standard fan definition1', 'JVEC-SP'],
[108, 'standard fan definition1', 'JVEC-SP'],
[109, 'standard fan definition1', 'JVEC-SP'],
[110, 'standard fan definition1', 'JVEC-SP'],
[111, 'standard fan definition1', 'JVEC-SP'],
[112, 'standard fan definition1', 'JVEC-SP'],
[113, 'standard fan definition1', 'JVEC-SP'],
[114, 'standard fan definition1', 'JVEC-SP'],
[115, 'standard fan definition1', 'JVEC-SP'],
[116, 'standard fan definition1', 'JVEC-SP'],
[117, 'standard fan definition1', 'JVEC-SP'],
[118, 'standard fan definition1', 'JVEC-SP'],
[119, 'standard fan definition1', 'JVEC-SP'],
[120, 'standard fan definition1', 'JVEC-SP'],
[121, 'standard fan definition1', 'JVEC-SP'],
[122, 'standard fan definition1', 'JVEC-SP'],
[123, 'standard fan definition1', 'JVEC-SP'],
[124, 'standard fan definition1', 'JVEC-SP'],
[125, 'standard fan definition1', 'JVEC-SP'],
[126, 'standard fan definition1', 'JVEC-SP'],
[127, 'standard fan definition1', 'JVEC-SP'],
[128, 'standard fan definition1', 'JVEC-SP'],
[129, 'standard fan definition1', 'JVEC-SP'],
[130, 'standard fan definition1', 'JVEC-SP'],
[131, 'standard fan definition1', 'JVEC-SP'],
[132, 'standard fan definition1', 'JVEC-SP'],
[133, 'standard fan definition1', 'JVEC-SP'],
[134, 'standard fan definition1', 'JVEC-SP'],
[135, 'standard fan definition1', 'JVEC-SP'],
[136, 'standard fan definition1', 'JVEC-SP'],
[137, 'standard fan definition1', 'JVEC-SP'],
[138, 'standard fan definition1', 'JVEC-SP'],
[139, 'standard fan definition1', 'JVEC-SP'],
[140, 'standard fan definition1', 'JVEC-SP'],
[141, 'standard fan definition1', 'JVEC-SP'],
[142, 'standard fan definition1', 'JVEC-SP'],
[143, 'standard fan definition1', 'JVEC-SP'],
[144, 'standard fan definition1', 'JVEC-SP'],
[145, 'standard fan definition1', 'JVEC-SP'],
[146, 'standard fan definition1', 'JVEC-SP'],
[147, 'standard fan definition1', 'JVEC-SP'],
[148, 'standard fan definition1', 'JVEC-SP'],
[149, 'standard fan definition1', 'JVEC-SP'],
[150, 'standard fan definition1', 'JVEC-SP']]
result = {}
for address, fan_definitions_name, fan_type in list_address_of_selected_fans:
result.setdefault(fan_definitions_name, set()).add(int(address))
print(result)
result ends up being -> {'standard fan definition1': {128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127}}结果最终是 -> {'standard fan definition1': {128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146、147、148、149、150、101、102、103、104、105、106、107、108、109、110、111、112、113、114、115、116、117、118、119、120、 121, 122, 123, 124, 125, 126, 127}}
Why is it doing this?为什么要这样做？ The numbers should be in order such as they are initially in the list_address_of_selected_fans variable.这些数字应按顺序排列，例如它们最初位于 list_address_of_selected_fans 变量中。
EDIT2: here is live code showing the issue https://repl.it/talk/share/adding-values-to-defaultdict-set-breaking-on-128/122013 EDIT2：这是显示问题https://repl.it/talk/share/adding-values-to-defaultdict-set-breaking-on-128/122013的实时代码
1 个解决方案
解决方案1
2 已采纳 2021-02-15 20:00:40
The set() object is an unordered collection (see https://docs.python.org/3.8/library/stdtypes.html#set-types-set-frozenset ) set() object 是无序集合（参见https://docs.python.org/3.8/library/stdtypes.html#set-types- ）
For your purposes, if you want them in the order in which they originally appeared and you are going to allow repeats, you could swap out your set() and add() for list() and append():出于您的目的，如果您希望它们按最初出现的顺序排列并且您将允许重复，您可以将 set() 和 add() 换成 list() 和 append()：
for address, fan_definitions_name, fan_type in list_address_of_selected_fans:
result.setdefault(fan_definitions_name, list()).append(int(address))
If you want to ignore repeats, then you'd have to check for those by creating sets in addition to the lists...:如果你想忽略重复，那么你必须通过在列表之外创建集合来检查这些......：
result = {}
result_sets = {}
for address, fan_definitions_name, fan_type in list_address_of_selected_fans:
iaddress = int(address)
prev_set = result_sets.get(fan_definitions_name, set())
if (iaddress not in prev_set):
result.setdefault(fan_definitions_name, list()).append(iaddress)
result_sets.setdefault(fan_definitions_name, set()).add(iaddress)
Or, if you want to have it all in one variable and less code, you can accomplish that with OrderedDict like so:或者，如果您想在一个变量中使用更少的代码，您可以使用 OrderedDict 来完成，如下所示：
from collections import OrderedDict
result = {}
for address, fan_definitions_name, fan_type in list_address_of_selected_fans:
result.setdefault(fan_definitions_name, OrderedDict())[int(address)] = None
print(result['standard fan definition1'].keys())
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