DataFrame如何找出有空值的行

import pandas as pdimport numpy as np

n = np.arange(20, dtype=float).reshape(5,4)
n[2,3] = np.nan
index = ['index1', 'index2', 'index3', 'index4', 'index5']
columns = ['column1', 'column2', 'column3', 'column4']
frame3 = pd.DataFrame(data=n, index=index, columns=columns)

frame3

frame3.isnull()

# any() 作用：返回是否至少一个元素为真
# 直接求any()，得到的每一列求any()计算的结果
frame3.isnull().any()

column1    False
column2    False
column3    False
column4     True
dtype: bool

# 方法一：设置any的axis参数
frame3.isnull().any(axis = 1)

index1    False
index2    False
index3     True
index4    False
index5    False
dtype: bool

# 方法二：先转置再any
frame3.isnull().T.any()

index1    False
index2    False
index3     True
index4    False
index5    False
dtype: bool

frame3[frame3.isnull().any(axis = 1)==False]

frame3[frame3.isnull().any(axis = 1)==True]