[英]How to merge columns into single column in dataframe pandas?
原件 dataframe
Parent Family Name Money A Money B
Jack Everdeen 10000 20000
Rita Lawrence 4000 2000
Amy Donnie 5000 9000
我想要的是。
Parent Family Name Money Money
Jack Everdeen Money A 10000
Jack Everdeen Money B 20000
Rita Lawrence Money A 4000
Rita Lawrence Money B 2000
Amy Donnie Money A 5000
Amy Donnie Money B 9000
我用 pivot function 試過了,但它不起作用。 我的代碼如下。
data_1 = [['Jack','Everdeen',10000,20000],['Rita','Lawrence',4000,2000],['Amy','Donnie',5000,9000]]
df_1 = pd.DataFrame(data_1,columns=['Parent','Family Name','Money A','Money B'],dtype=float)
print(df_1)
loading_pivot_table = pd.pivot_table(df_1
,index = ['Parent','Family Name']
,columns = ['Parent','Family Name']
,values = ['Money A','Money B']
,fill_value = 0)
#convert pivot table to DataFrame
loading_pivot_table_convert = loading_pivot_table.reset_index()
print(loading_pivot_table_convert)
融化它
pd.melt(df_1, id_vars=['Parent','Family Name'], var_name='MoneyCol', value_name='Money').sort_values('Parent',ascending=False)
Out[13]:
Parent Family Name MoneyCol Money
1 Rita Lawrence Money A 4000.0
4 Rita Lawrence Money B 2000.0
0 Jack Everdeen Money A 10000.0
3 Jack Everdeen Money B 20000.0
2 Amy Donnie Money A 5000.0
5 Amy Donnie Money B 9000.0
你試過設置索引嗎?
df.set_index(['a', 'b', 'c'])
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