根据逻辑条件，R的子类等价物是什么？

Question

我要计算这个从r相当于大熊猫：

df$received[df$gender == 'F'] 

在熊猫，如果我使用：

df['received'][df['gender'] == 'F'] 

这是行不通的。

或者，如果我尝试：

df['received'] & df['gender'] == 'F' 

它给了我：unsupported operand type(s) for &: 'float' and 'bool'

Answer 1

看来你需要loc与boolean indexing：

df.loc[df['gender'] == 'F', 'received'] 

样品：

df = pd.DataFrame({'gender':['F','M','F'], 'received':[10,20,50]}) 
print (df) 
    gender received 
0  F  10 
1  M  20 
2  F  50 

print (df.loc[df['gender'] == 'F', 'received']) 
0 10 
2 50 
Name: received, dtype: int64