Question

我有这个数据框：

df:
    A       B
0   a       class1
1   b       class12
2   a       class2
3   a       class1
4   b       class13

所以，我将df像这样分组：

df=df.groupby(['A', 'B'])['B'].count()

我明白了

A    B 
a    class1    2
     class2    1
b    class12   1
     class13   1

然后我需要访问此值，并且我正考虑将它们保存在数组数组中，因此我可以轻松地读取它并将其表示在表中，如下所示：

array = [[a,[class1,1],[class2,1]],[b,[class12,1],[class13,1]]]

哪个是最好的方法？还有其他更好的选择吗？

在我真正的问题中，我不知道将拥有哪些组或组元素，并且在进行groupby操作之后，我需要列出所有这些元素。

谢谢

Answer 1

简洁

[[n, [*d.B.value_counts().items()]] for n, d in df.groupby('A')]

[['a', [('class1', 2), ('class2', 1)]],
 ['b', [('class13', 1), ('class12', 1)]]]

如果要列表而不是元组

[[n, [*map(list, d.B.value_counts().items())]] for n, d in df.groupby('A')]

[['a', [['class1', 2], ['class2', 1]]],
 ['b', [['class13', 1], ['class12', 1]]]]

`dict`

d = {}
for a, b in df.itertuples(index=False):
    d.setdefault(a, {}).setdefault(b, 0)
    d[a][b] += 1

[[k, [*map(list, v.items())]] for k, v in d.items()]

[['a', [['class1', 2], ['class2', 1]]],
 ['b', [['class12', 1], ['class13', 1]]]]

Answer 2

以您的情况

    public ActionResult Index()
    {
        var vaultAddress = WebConfigurationManager.AppSettings["VaultUrl"];
        KeyVaultClient keyVaultClient = new KeyVaultClient(new KeyVaultClient.AuthenticationCallback(GetAccessToken));
        var username = keyVaultClient.GetSecretAsync(vaultAddress, "ADUsername", ConfigurationManager.AppSettings["ADUsernameVersion"]).GetAwaiter().GetResult().Value;
        var password = keyVaultClient.GetSecretAsync(vaultAddress, "ADPassword", ConfigurationManager.AppSettings["ADPasswordVersion"]).GetAwaiter().GetResult().Value;
        Init();
        return View();
    }

    public static async Task<string> GetAccessToken(string authority, string resource, string scope)
    {
        var clientId = WebConfigurationManager.AppSettings["ClientId"];
        var clientSecret = WebConfigurationManager.AppSettings["ClientSecret"];
        ClientCredential clientCredential = new ClientCredential(clientId, clientSecret);

        var context = new AuthenticationContext(authority, TokenCache.DefaultShared);
        var result = await context.AcquireTokenAsync(resource, clientCredential);

        return result.AccessToken;
    }

获取数组中组和组元素的名称

2 个答案:

简洁

`dict`