3.5.4 分组、合并、透视表

1.导入三方库

import numpy as np
import pandas as pd

df = pd.read_csv(\'table.csv\',index_col=\'ID\') #用来指定表格的索引值
​
df.head(2)

 

	School	Class	Gender	Address	Height	Weight	Math	Physics
ID
1101	S_1	C_1	M	street_1	173	63	34.0	A+
1102	S_1	C_1	F	street_2	192	73	32.5	B+

​

 

 

2.分组

单列分组

danlie = df.groupby(\'School\')

danlie.sum()

 

​

​

	Height	Weight	Math
School
S_1	2636	1050	956.2
S_2	3459	1563	1191.1

​

 

多列分组

duolie = df.groupby([\'School\',\'Class\'])

duolie.sum()

 

​

 

​

		Height	Weight	Math
School	Class
S_1	C_1	877	363	318.9
	C_2	853	341	321.5
	C_3	906	346	315.8
S_2	C_1	821	384	292.8
	C_2	900	418	314.0
	C_3	869	419	315.3
	C_4	869	342	269.0

​

 

 

提取指定字段并指定分组的列

tiqu = df[\'Address Math\'.split()].groupby(by=\'Address\')

tiqu.count()

 

​

 

​

​

	Math
Address
street_1	3
street_2	6
street_4	8
street_5	6
street_6	6
street_7	6

​

</div>

 

3.合并

sheet = pd.ExcelFile(\'用户借款数据.xlsx\')

sheet.sheet_names

 

[\'基础信息\', \'就业信息\', \'借款信息\']

 

hb1 = pd.read_excel(\'用户借款数据.xlsx\',sheet_name=\'基础信息\')
hb2 = pd.read_excel(\'用户借款数据.xlsx\',sheet_name=\'就业信息\')
hb3 = pd.read_excel(\'用户借款数据.xlsx\',sheet_name=\'借款信息\')

hb1.info()

<class \'pandas.core.frame.DataFrame\'>
RangeIndex: 999 entries, 0 to 998
Data columns (total 8 columns):
 #   Column   Non-Null Count  Dtype  
---  ------   --------------  -----  
 0   编号       999 non-null    int64  
 1   城市       999 non-null    object 
 2   国家       999 non-null    object 
 3   出生日期     999 non-null    object 
 4   教育程度     999 non-null    int64  
 5   性别       999 non-null    int64  
 6   房屋所有权类型  763 non-null    float64
 7   婚姻状况     999 non-null    int64  
dtypes: float64(1), int64(4), object(3)
memory usage: 62.6+ KB

 

hb1.head(6)

 

​

 

​

​

	编号	城市	国家	出生日期	教育程度	性别	房屋所有权类型	婚姻状况
0	0	AESPA	EE	21/11/1975	4	0	6.0	4
1	2	P脛RNU	EE	25/10/1969	4	1	9.0	1
2	3	TALLINN	EE	22/11/1965	4	0	1.0	4
3	4	KEHTNA	EE	05/12/1983	2	0	1.0	3
4	5	KIVI脮LI	EE	13/07/1980	4	1	4.0	3
5	6	P脛RNU	EE	05/07/1993	3	1	2.0	3

​

</div>

 

hb2.info()

<class \'pandas.core.frame.DataFrame\'>
RangeIndex: 999 entries, 0 to 998
Data columns (total 9 columns):
 #   Column     Non-Null Count  Dtype  
---  ------     --------------  -----  
 0   编号         999 non-null    int64  
 1   申请签字时间     999 non-null    int64  
 2   申请签证周      999 non-null    int64  
 3   当前雇主的雇佣期限  926 non-null    object 
 4   就业岗位       962 non-null    object 
 5   就业状况       977 non-null    float64
 6   主要工作收入     999 non-null    int64  
 7   收入总额       999 non-null    int64  
 8   工作经验       999 non-null    object 
dtypes: float64(1), int64(5), object(3)
memory usage: 70.4+ KB

 

hb2.head(6)

 

​

 

​

	编号	申请签字时间	申请签证周	当前雇主的雇佣期限	就业岗位	就业状况	主要工作收入	收入总额	工作经验
0	0	12	4	UpTo5Years	Worker	3.0	1000	1000	15To25Years
1	2	14	2	MoreThan5Years	SpecialistOfficeWorker	3.0	633	633	15To25Years
2	3	22	4	MoreThan5Years	Owner	5.0	550	550	MoreThan25Years
3	4	15	3	MoreThan5Years	Worker	3.0	833	833	5To10Years
4	5	10	3	MoreThan5Years	Worker	3.0	341	341	5To10Years
5	6	14	4	UpTo1Year	Worker	3.0	430	430	LessThan2Years

​

 

 

hb3.info()

<class \'pandas.core.frame.DataFrame\'>
RangeIndex: 899 entries, 0 to 898
Data columns (total 12 columns):
 #   Column  Non-Null Count  Dtype  
---  ------  --------------  -----  
 0   编号      899 non-null    int64  
 1   状态      899 non-null    object 
 2   金额      899 non-null    float64
 3   现有负债    899 non-null    int64  
 4   贷款日期    899 non-null    object 
 5   贷款期限    899 non-null    int64  
 6   新信用客户   899 non-null    bool   
 7   贷前贷款数   899 non-null    int64  
 8   占用区     859 non-null    float64
 9   贷款用途    899 non-null    int64  
 10  先前得分    763 non-null    float64
 11  违约      899 non-null    bool   
dtypes: bool(2), float64(3), int64(5), object(2)
memory usage: 72.1+ KB

 

hb3.head()

 

​

 

​

	编号	状态	金额	现有负债	贷款日期	贷款期限	新信用客户	贷前贷款数	占用区	贷款用途	先前得分	违约
0	0	Current	5000.0	9	05/05/2015	60	False	1	8.0	0	0.0957	False
1	2	Repaid	530.0	7	19/10/2015	60	True	0	1.0	2	0.1034	False
2	3	Current	5500.0	1	02/09/2015	60	True	0	13.0	2	0.0772	False
3	4	Repaid	6900.0	10	20/05/2015	60	False	1	19.0	7	0.0773	False
4	5	Current	2655.0	6	29/12/2015	60	True	0	17.0	2	0.1898	False

​

 

data2 = pd.merge(hb1,hb2,how=\'outer\')

data2

 

​

​

	编号	城市	国家	出生日期	教育程度	性别	房屋所有权类型	婚姻状况	申请签字时间	申请签证周	当前雇主的雇佣期限	就业岗位	就业状况	主要工作收入	收入总额	工作经验
0	0	AESPA	EE	21/11/1975	4	0	6.0	4	12	4	UpTo5Years	Worker	3.0	1000	1000	15To25Years
1	2	P脛RNU	EE	25/10/1969	4	1	9.0	1	14	2	MoreThan5Years	SpecialistOfficeWorker	3.0	633	633	15To25Years
2	3	TALLINN	EE	22/11/1965	4	0	1.0	4	22	4	MoreThan5Years	Owner	5.0	550	550	MoreThan25Years
3	4	KEHTNA	EE	05/12/1983	2	0	1.0	3	15	3	MoreThan5Years	Worker	3.0	833	833	5To10Years
4	5	KIVI脮LI	EE	13/07/1980	4	1	4.0	3	10	3	MoreThan5Years	Worker	3.0	341	341	5To10Years
...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...
994	1257	P脛RISPEA	EE	08/04/1971	3	0	NaN	3	19	5	UpTo2Years	valvur	3.0	3820	8452	10To15Years
995	1258	TALLINN	EE	29/11/1949	4	1	NaN	5	13	6	UpTo4Years	klienditeenindaja	3.0	9000	9000	MoreThan25Years
996	1259	UUEM脮ISA	EE	21/02/1979	4	1	NaN	1	17	1	UpTo1Year	Noorem referent	3.0	7200	7500	10To15Years
997	1260	TARTU	EE	21/10/1983	5	1	NaN	3	16	7	NaN	administraator	3.0	6500	10500	2To5Years
998	1261	VILJANDI	EE	30/08/1977	1	1	NaN	2	21	7	MoreThan5Years	NaN	3.0	8000	8300	10To15Years

999 rows × 16 columns

​

</div>

 

4.透视表

shuju = pd.read_csv(\'table.csv\')

shuju.head()

 

​

 

​

​

	School	Class	ID	Gender	Address	Height	Weight	Math	Physics
0	S_1	C_1	1101	M	street_1	173	63	34.0	A+
1	S_1	C_1	1102	F	street_2	192	73	32.5	B+
2	S_1	C_1	1103	M	street_2	186	82	87.2	B+
3	S_1	C_1	1104	F	street_2	167	81	80.4	B-
4	S_1	C_1	1105	F	street_4	159	64	84.8	B+

​

</div>

 

pivot_table

pd.pivot_table(shuju,index=\'ID\',columns=\'Gender\',values=\'Height\').head()

 

​

 

​

​

Gender	F	M
ID
1101	NaN	173.0
1102	192.0	NaN
1103	NaN	186.0
1104	167.0	NaN
1105	159.0	NaN

​

 

 

四个参数

pd.pivot_table(shuju,index=\'Gender\',columns=\'School\',values=\'Height\',aggfunc=[\'mean\',\'sum\'])

 

​

 

​

​

	mean		sum
School	S_1	S_2	S_1	S_2
Gender
F	173.125000	173.727273	1385	1911
M	178.714286	172.000000	1251	1548

​

 

pd.pivot_table(shuju,index=[\'School\',\'Class\'],columns=[\'Gender\',\'Address\'],values=[\'Height\',\'Weight\'])

 

​

		Height										...	Weight
	Gender	F						M				...	F				M
	Address	street_1	street_2	street_4	street_5	street_6	street_7	street_1	street_2	street_4	street_5	...	street_4	street_5	street_6	street_7	street_1	street_2	street_4	street_5	street_6	street_7
School	Class
S_1	C_1	NaN	179.5	159.0	NaN	NaN	NaN	173.0	186.0	NaN	NaN	...	64.0	NaN	NaN	NaN	63.0	82.0	NaN	NaN	NaN	NaN
	C_2	NaN	NaN	176.0	162.0	167.0	NaN	NaN	NaN	NaN	188.0	...	94.0	63.0	63.0	NaN	NaN	NaN	NaN	68.0	53.0	NaN
	C_3	175.0	NaN	NaN	187.0	NaN	NaN	NaN	195.0	161.0	NaN	...	NaN	69.0	NaN	NaN	NaN	70.0	68.0	NaN	NaN	82.0
S_2	C_1	NaN	NaN	NaN	159.0	161.0	NaN	NaN	NaN	163.5	NaN	...	NaN	97.0	61.0	NaN	NaN	NaN	71.0	NaN	NaN	84.0
	C_2	NaN	NaN	NaN	NaN	NaN	188.5	175.0	NaN	155.0	193.0	...	NaN	NaN	NaN	76.5	74.0	NaN	91.0	100.0	NaN	NaN
	C_3	NaN	NaN	157.0	NaN	164.0	190.0	NaN	NaN	187.0	171.0	...	78.0	NaN	81.0	99.0	NaN	NaN	73.0	88.0	NaN	NaN
	C_4	NaN	176.0	NaN	NaN	175.5	NaN	NaN	NaN	NaN	NaN	...	NaN	NaN	57.0	NaN	NaN	NaN	NaN	NaN	NaN	82.0

7 rows × 24 columns

​