[英]Check if values from one column, exists in multiple columns in another dataframe
[英]Copy the values of multiple columns of a dataframe into 1 column of another dataframe
ID a1 a2 b1 b2
1
2
3
4
...
300
我想創建一個新的 dataframe 合並列 a1 a2 和 b1、b2。 目的是獲得這樣的東西:
ID a b
1
2
3
4
...
600
其中a基本上由兩列a1、a2一個接一個地給出。 有什么建議么?
它確實有效,但我想知道是否有更快的解決方案。 這是代碼:
df1 = pd.DataFrame(columns=['CNTR_CODE', 'Risk_damage', 'pot_tot_loss','annual_tot_loss'])
df2 = pd.DataFrame(columns=['CNTR_CODE', 'Risk_damage', 'pot_tot_loss','annual_tot_loss'])
df3 = pd.DataFrame(columns=['CNTR_CODE', 'Risk_damage', 'pot_tot_loss','annual_tot_loss'])
df4 = pd.DataFrame(columns=['CNTR_CODE', 'Risk_damage', 'pot_tot_loss','annual_tot_loss'])
df5 = pd.DataFrame(columns=['CNTR_CODE', 'Risk_damage', 'pot_tot_loss','annual_tot_loss'])
df6 = pd.DataFrame(columns=['CNTR_CODE', 'Risk_damage', 'pot_tot_loss','annual_tot_loss'])
df7 = pd.DataFrame(columns=['CNTR_CODE', 'Risk_damage', 'pot_tot_loss','annual_tot_loss'])
df8 = pd.DataFrame(columns=['CNTR_CODE', 'Risk_damage', 'pot_tot_loss','annual_tot_loss'])
df9 = pd.DataFrame(columns=['CNTR_CODE', 'Risk_damage', 'pot_tot_loss','annual_tot_loss'])
df1[["CNTR_CODE", 'Risk_damage', 'pot_tot_loss','annual_tot_loss']]=copy_df[["CNTR_CODE", 'Risk_damage0','pot_tot_loss00', 'annual_tot_loss00']]
df2[["CNTR_CODE", 'pot_tot_loss','annual_tot_loss']]=copy_df[["CNTR_CODE", 'pot_tot_loss01','annual_tot_loss01']]
df3[["CNTR_CODE", 'pot_tot_loss','annual_tot_loss']]=copy_df[["CNTR_CODE", 'pot_tot_loss02','annual_tot_loss02']]
df4[["CNTR_CODE", 'Risk_damage', 'pot_tot_loss','annual_tot_loss']]=copy_df[["CNTR_CODE", 'Risk_damage1','pot_tot_loss10', 'annual_tot_loss10']]
df5[["CNTR_CODE", 'pot_tot_loss','annual_tot_loss']]=copy_df[["CNTR_CODE", 'pot_tot_loss11','annual_tot_loss11']]
df6[["CNTR_CODE", 'pot_tot_loss','annual_tot_loss']]=copy_df[["CNTR_CODE", 'pot_tot_loss12','annual_tot_loss12']]
df7[["CNTR_CODE", 'Risk_damage', 'pot_tot_loss','annual_tot_loss']]=copy_df[["CNTR_CODE", 'Risk_damage2','pot_tot_loss20', 'annual_tot_loss20']]
df8[["CNTR_CODE", 'pot_tot_loss','annual_tot_loss']]=copy_df[["CNTR_CODE", 'pot_tot_loss21','annual_tot_loss21']]
df9[["CNTR_CODE", 'pot_tot_loss','annual_tot_loss']]=copy_df[["CNTR_CODE", 'pot_tot_loss22','annual_tot_loss22']]
new_df=pd.concat([df1, df2,df3,df4,df5,df6,df7,df8,df9]).reset_index()
先拿臨時的dataframe這樣
df1[["a", "b"]]=df[["a1", "b1"]]
df2[["a", "b"]]=df[["a2", "b2"]]
這將給出兩個數據幀,然后將兩者連接起來
new_df=pd.concat([df1, df2]).reset_index()
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.