如何在基於條件的python中進行合併？

Question

我想知道是否有可能通過給出'if'語句來合併兩個數據框。 例如

DF

number account_name classification 
    1  name   named 
    2  place  partner 
    3  animal  class 
    4  thing  territory 
    5  dog   home 

DF1

account_name Number country 
name   1   xx 
place   2   xy 
animal   7   yz 
dog    8   zx 

我要尋找一個類似的代碼如下

pd.merge(df,df1, on= 'account_name') if df[number] == df1[number] 

結果是前人的精力像

number account_name classification number Country 
    1  name   named   1  xx 
    2  place  partner  2  xy 

我試過拉姆達功能以及，代碼爲

x['nn'] = x.apply(lambda y: pd.merge(df, df1, on = 'account_name') if df[number] == df1[number] else 1, axis=1) 

Answer 1

看來你需要添加列參數on：

df = pd.merge(df,df1, on= ['account_name', 'number']) 
print (df) 
    number account_name classification country 
0  1   name   named  xx 
1  2  place  partner  xy 

但是，如果列名是不同的使用參數left_on和right_on in merge：

df = pd.merge(df, 
       df1, 
       left_on= ['account_name', 'number'], 
       right_on= ['account_name', 'Number']) 
print (df) 
    number account_name classification Number country 
0  1   name   named  1  xx 
1  2  place  partner  2  xy