Python 将df.groupby（）形成的组拆分为具有这些分组值的多个数据帧_Python_Pandas_Dataframe_Group By_Pandas Groupby

Python 将df.groupby（）形成的组拆分为具有这些分组值的多个数据帧

python pandas dataframe

Python 将df.groupby（）形成的组拆分为具有这些分组值的多个数据帧,python,pandas,dataframe,group-by,pandas-groupby,Python,Pandas,Dataframe,Group By,Pandas Groupby,我有一个包含列的数据集，如变速箱、传动系和燃油类型，这三个列都是分类的。现在，如果我运行代码： df.groupby(['Transmission','dt','Fuel_Type'])['PRICE'].mean() 它给出了多个组及其平均价格。我想要的是假设这个groupby给我这样的输出（5组）：因此，现在我需要5个新的数据帧，分别带有变速箱、传动系和燃油类型值以及其他条目和列。您可以执行以下操作。假设您的数据帧如下所示： Transmission drivetrain

我有一个包含列的数据集，如

变速箱

、

传动系

和

燃油类型

，这三个列都是分类的。现在，如果我运行代码：

df.groupby(['Transmission','dt','Fuel_Type'])['PRICE'].mean()

它给出了多个组及其平均价格。我想要的是假设这个groupby给我这样的输出（5组）：

因此，现在我需要5个新的数据帧，分别带有

变速箱

、

传动系

和

燃油类型

值以及其他条目和列。

您可以执行以下操作。假设您的数据帧如下所示：

Transmission        drivetrain Fuel_type     PRICE
0     Automatic   All-Wheel Drive    Diesel    434344
1        Manual  Four-Wheel Drive    Diesel    323232
2           CVT   All-Wheel Drive    Diesel      5355
3     Automatic  Four-Wheel Drive    Diesel  53534534
4        Manual  Four-Wheel Drive  Gasoline   4424422
5           CVT   All-Wheel Drive  Gasoline    242442
6     Automatic  Four-Wheel Drive  Gasoline     42424
7        Manual  Four-Wheel Drive  Gasoline     57757
8           CVT  Four-Wheel Drive  Gasoline      4244
9     Automatic  Four-Wheel Drive      Flex     78997
10       Manual   All-Wheel Drive      Flex      7989
11          CVT  Four-Wheel Drive      Flex     46456
12    Automatic  Four-Wheel Drive      Flex      4646
13       Manual   All-Wheel Drive      Flex      4646
14          CVT  Four-Wheel Drive      Flex    487979

现在，您需要按组计算平均值：

df.groupby(['Transmission', 'drivetrain', 'Fuel_type'])['PRICE'].mean()

其中打印：

Transmission  drivetrain        Fuel_type
Automatic     All-Wheel Drive   Diesel         434344.0
              Four-Wheel Drive  Diesel       53534534.0
                                Flex            41821.5
                                Gasoline        42424.0
CVT           All-Wheel Drive   Diesel           5355.0
                                Gasoline       242442.0
              Four-Wheel Drive  Flex           267217.5
                                Gasoline         4244.0
Manual        All-Wheel Drive   Flex             6317.5
              Four-Wheel Drive  Diesel         323232.0
                                Gasoline      2241089.5
Name: PRICE, dtype: float64

现在，为了能够为每个组创建单独的数据帧：

(Automatic, Four-Wheel Drive, Diesel, Mean)
((Automatic, All-Wheel Drive, Diesel, Mean)
......

可以将每个组合转换为字典中的元素：

Groups = dict(tuple(df.groupby(['Transmission','drivetrain','Fuel_type'])))
Groups

其中：

{('Automatic',
  'All-Wheel Drive',
  'Diesel'):   Transmission       drivetrain Fuel_type   PRICE
 0    Automatic  All-Wheel Drive    Diesel  434344,
 ('Automatic',
  'Four-Wheel Drive',
  'Diesel'):   Transmission        drivetrain Fuel_type     PRICE
 3    Automatic  Four-Wheel Drive    Diesel  53534534,
 ('Automatic',
  'Four-Wheel Drive',
  'Flex'):    Transmission        drivetrain Fuel_type  PRICE
 9     Automatic  Four-Wheel Drive      Flex  78997
 12    Automatic  Four-Wheel Drive      Flex   4646,
 ('Automatic',
  'Four-Wheel Drive',
  'Gasoline'):   Transmission        drivetrain Fuel_type  PRICE
 6    Automatic  Four-Wheel Drive  Gasoline  42424,
 ('CVT',
  'All-Wheel Drive',
  'Diesel'):   Transmission       drivetrain Fuel_type  PRICE
 2          CVT  All-Wheel Drive    Diesel   5355,
 ('CVT',
  'All-Wheel Drive',
  'Gasoline'):   Transmission       drivetrain Fuel_type   PRICE
 5          CVT  All-Wheel Drive  Gasoline  242442,
 ('CVT',
  'Four-Wheel Drive',
  'Flex'):    Transmission        drivetrain Fuel_type   PRICE
 11          CVT  Four-Wheel Drive      Flex   46456
 14          CVT  Four-Wheel Drive      Flex  487979,
 ('CVT',
  'Four-Wheel Drive',
  'Gasoline'):   Transmission        drivetrain Fuel_type  PRICE
 8          CVT  Four-Wheel Drive  Gasoline   4244,
 ('Manual',
  'All-Wheel Drive',
  'Flex'):    Transmission       drivetrain Fuel_type  PRICE
 10       Manual  All-Wheel Drive      Flex   7989
 13       Manual  All-Wheel Drive      Flex   4646,
 ('Manual',
  'Four-Wheel Drive',
  'Diesel'):   Transmission        drivetrain Fuel_type   PRICE
 1       Manual  Four-Wheel Drive    Diesel  323232,
 ('Manual',
  'Four-Wheel Drive',
  'Gasoline'):   Transmission        drivetrain Fuel_type    PRICE
 4       Manual  Four-Wheel Drive  Gasoline  4424422
 7       Manual  Four-Wheel Drive  Gasoline    57757}

Transmission       drivetrain Fuel_type   PRICE
0    Automatic  All-Wheel Drive    Diesel  434344

从中，您可以提取所需的任何组合，例如：

df_aut_drive_fuel = Groups['Automatic','All-Wheel Drive', 'Diesel']

其中：

{('Automatic',
  'All-Wheel Drive',
  'Diesel'):   Transmission       drivetrain Fuel_type   PRICE
 0    Automatic  All-Wheel Drive    Diesel  434344,
 ('Automatic',
  'Four-Wheel Drive',
  'Diesel'):   Transmission        drivetrain Fuel_type     PRICE
 3    Automatic  Four-Wheel Drive    Diesel  53534534,
 ('Automatic',
  'Four-Wheel Drive',
  'Flex'):    Transmission        drivetrain Fuel_type  PRICE
 9     Automatic  Four-Wheel Drive      Flex  78997
 12    Automatic  Four-Wheel Drive      Flex   4646,
 ('Automatic',
  'Four-Wheel Drive',
  'Gasoline'):   Transmission        drivetrain Fuel_type  PRICE
 6    Automatic  Four-Wheel Drive  Gasoline  42424,
 ('CVT',
  'All-Wheel Drive',
  'Diesel'):   Transmission       drivetrain Fuel_type  PRICE
 2          CVT  All-Wheel Drive    Diesel   5355,
 ('CVT',
  'All-Wheel Drive',
  'Gasoline'):   Transmission       drivetrain Fuel_type   PRICE
 5          CVT  All-Wheel Drive  Gasoline  242442,
 ('CVT',
  'Four-Wheel Drive',
  'Flex'):    Transmission        drivetrain Fuel_type   PRICE
 11          CVT  Four-Wheel Drive      Flex   46456
 14          CVT  Four-Wheel Drive      Flex  487979,
 ('CVT',
  'Four-Wheel Drive',
  'Gasoline'):   Transmission        drivetrain Fuel_type  PRICE
 8          CVT  Four-Wheel Drive  Gasoline   4244,
 ('Manual',
  'All-Wheel Drive',
  'Flex'):    Transmission       drivetrain Fuel_type  PRICE
 10       Manual  All-Wheel Drive      Flex   7989
 13       Manual  All-Wheel Drive      Flex   4646,
 ('Manual',
  'Four-Wheel Drive',
  'Diesel'):   Transmission        drivetrain Fuel_type   PRICE
 1       Manual  Four-Wheel Drive    Diesel  323232,
 ('Manual',
  'Four-Wheel Drive',
  'Gasoline'):   Transmission        drivetrain Fuel_type    PRICE
 4       Manual  Four-Wheel Drive  Gasoline  4424422
 7       Manual  Four-Wheel Drive  Gasoline    57757}

Transmission       drivetrain Fuel_type   PRICE
0    Automatic  All-Wheel Drive    Diesel  434344

或

Transmission        drivetrain Fuel_type    PRICE
4       Manual  Four-Wheel Drive  Gasoline  4424422
7       Manual  Four-Wheel Drive  Gasoline    57757

你好你能分享一份数据样本吗？可能会有帮助。还有，这可能是你想要的答案：是的，兄弟，它工作得很快。谢谢！很高兴它有帮助！