根據邏輯條件，R的子類等價物是什麼？

Question

我要計算這個從r相當於大熊貓：

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

在熊貓，如果我使用：

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

這是行不通的。

或者，如果我嘗試：

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

它給了我：unsupported operand type(s) for &: 'float' and 'bool'

Answer 1

看來你需要loc與boolean indexing：

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

樣品：

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