Question

下面是我的数据框：

X1  X2  X3  X4  X5
A   B   C   10  BAM
A   A   A   12  BAM
B   B   B   10  BAM
A   B   B   60  BAM

我希望那些在same values中有columns(X1, X2,X3)的行。在这里我们可以看到2nd和3rd行在以上3列中具有相同的值。我想要的输出是：

 X1 X2  X3  X4  X5
A   A   A   12  BAM
B   B   B   10  BAM

我尝试如下：

yourdf1=df[df.nunique(0)==0]
print(yourdf1)

但是在这里我得到一个错误。谁能帮我。

Answer 1

选择列表中的列以通过DataFrame.nunique中的axis=1测试每行的唯一值数量，并通过boolean indexing测试1进行过滤：

yourdf1 = df[df[['X1','X2','X3']].nunique(axis=1) == 1]
print(yourdf1)
  X1 X2 X3  X4   X5
1  A  A  A  12  BAM
2  B  B  B  10  BAM

另一种解决方案是将DataFrame.eq与过滤后的DataFrame一起使用，按第一列进行比较，并按DataFrame.all获取每行的所有True：

df1 = df[['X1','X2','X3']]
yourdf1 = df[df1.eq(df1.iloc[:, 0], axis=0).all(axis=1)]
print(yourdf1)

  X1 X2 X3  X4   X5
1  A  A  A  12  BAM
2  B  B  B  10  BAM

Answer 2

尝试

/*
|--------------------------------------------------------------------------
| Default Database Connection Name
|--------------------------------------------------------------------------
|
| Here you may specify which of the database connections below you wish
| to use as your default connection for all database work. Of course
| you may use many connections at once using the Database library.
|
*/

'default' => env('DB_CONNECTION', 'mysql'),

/*
|--------------------------------------------------------------------------
| Database Connections
|--------------------------------------------------------------------------
|
| Here are each of the database connections setup for your application.
| Of course, examples of configuring each database platform that is
| supported by Laravel is shown below to make development simple.
|
|
| All database work in Laravel is done through the PHP PDO facilities
| so make sure you have the driver for your particular database of
| choice installed on your machine before you begin development.
|
*/

'connections' => [

    'sqlite' => [
        'driver' => 'sqlite',
        'database' => env('DB_DATABASE', database_path('database.sqlite')),
        'prefix' => '',
    ],

    'mongodb' => [
        'driver'   => 'mongodb',
        'host'     => env('MONGO_HOST', 'localhost'),
        'port'     => env('MONGO_PORT', 27017),
        'database' => env('MONGO_DATABASE',''),
        'username' => env('MONGO_USERNAME',''),
        'password' => env('MONGO_PASSWORD',''),
        'options'  => [
            'database' => 'admin' // sets the authentication database required by mongo 3
        ]
    ],

    'mysql' => [
        'driver' => 'mysql',
        'host' => env('DB_HOST', 'localhost'),
        'port' => env('DB_PORT', '3306'),
        'database' => env('DB_DATABASE', ''),
        'username' => env('DB_USERNAME', ''),
        'password' => env('DB_PASSWORD', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
        'dump' => [
            'use_single_transaction',
            'dump_binary_path' =>'E:\xampp\mysql\bin',
            'timeout' => 60*5,
        ],
    ],

    'pgsql' => [
        'driver' => 'pgsql',
        'host' => env('DB_HOST', '127.0.0.1'),
        'port' => env('DB_PORT', '5432'),
        'database' => env('DB_DATABASE', 'forge'),
        'username' => env('DB_USERNAME', 'forge'),
        'password' => env('DB_PASSWORD', ''),
        'charset' => 'utf8',
        'prefix' => '',
        'schema' => 'public',
        'sslmode' => 'prefer',
    ],

    'sqlsrv' => [
        'driver' => 'sqlsrv',
        'host' => env('DB_HOST', 'localhost'),
        'port' => env('DB_PORT', '1433'),
        'database' => env('DB_DATABASE', 'forge'),
        'username' => env('DB_USERNAME', 'forge'),
        'password' => env('DB_PASSWORD', ''),
        'charset' => 'utf8',
        'prefix' => '',
    ],

],

/*
|--------------------------------------------------------------------------
| Migration Repository Table
|--------------------------------------------------------------------------
|
| This table keeps track of all the migrations that have already run for
| your application. Using this information, we can determine which of
| the migrations on disk haven't actually been run in the database.
|
*/

'migrations' => 'migrations',

/*
|--------------------------------------------------------------------------
| Redis Databases
|--------------------------------------------------------------------------
|
| Redis is an open source, fast, and advanced key-value store that also
| provides a richer set of commands than a typical key-value systems
| such as APC or Memcached. Laravel makes it easy to dig right in.
|
*/

'redis' => [

    'client' => 'predis',

    'default' => [
        'host' => env('REDIS_HOST', '127.0.0.1'),
        'password' => env('REDIS_PASSWORD', null),
        'port' => env('REDIS_PORT', 6379),
        'database' => env('REDIS_DB', 0),
    ],

    'cache' => [
        'host' => env('REDIS_HOST', '127.0.0.1'),
        'password' => env('REDIS_PASSWORD', null),
        'port' => env('REDIS_PORT', 6379),
        'database' => env('REDIS_CACHE_DB', 1),
    ],

],

Answer 3

请参阅附件

df[df[['X1','X2','X3']].duplicated(keep=False)]

在Pandas Dataframe的多列（不是所有列）中查找具有相同值的行

3 个答案: