Python 在 pandas 数据框中显示具有一个或多个 NaN 值的行
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Display rows with one or more NaN values in pandas dataframe
提问by Peaceful
I have a dataframe in which some rows contain missing values.
我有一个数据框，其中一些行包含缺失值。
In [31]: df.head()
Out[31]:
alpha1 alpha2 gamma1 gamma2 chi2min
filename
M66_MI_NSRh35d32kpoints.dat 0.8016 0.9283 1.000000 0.074804 3.985599e+01
F71_sMI_DMRI51d.dat 0.0000 0.0000 NaN 0.000000 1.000000e+25
F62_sMI_St22d7.dat 1.7210 3.8330 0.237480 0.150000 1.091832e+01
F41_Car_HOC498d.dat 1.1670 2.8090 0.364190 0.300000 7.966335e+00
F78_MI_547d.dat 1.8970 5.4590 0.095319 0.100000 2.593468e+01
I want to display those rows on the screen. If I try df.isnull(), it gives a long dataframe with Trueand False. Is there any way by which I can select these rows and print them on the screen?
我想在屏幕上显示这些行。如果我尝试df.isnull()，它会给出一个带有True和的长数据帧False。有什么方法可以选择这些行并将它们打印在屏幕上？
回答by jezrael
You can use DataFrame.anywith parameter axis=1for check at least one Truein row by DataFrame.isnawith boolean indexing:
您可以使用DataFrame.any带有参数axis=1的至少一个核查True通过行DataFrame.isna用boolean indexing：
df1 = df[df.isna().any(axis=1)]
d = {'filename': ['M66_MI_NSRh35d32kpoints.dat', 'F71_sMI_DMRI51d.dat', 'F62_sMI_St22d7.dat', 'F41_Car_HOC498d.dat', 'F78_MI_547d.dat'], 'alpha1': [0.8016, 0.0, 1.721, 1.167, 1.897], 'alpha2': [0.9283, 0.0, 3.833, 2.809, 5.459], 'gamma1': [1.0, np.nan, 0.23748000000000002, 0.36419, 0.095319], 'gamma2': [0.074804, 0.0, 0.15, 0.3, np.nan], 'chi2min': [39.855990000000006, 1e+25, 10.91832, 7.966335000000001, 25.93468]}
df = pd.DataFrame(d).set_index('filename')
print (df)
alpha1 alpha2 gamma1 gamma2 chi2min
filename
M66_MI_NSRh35d32kpoints.dat 0.8016 0.9283 1.000000 0.074804 3.985599e+01
F71_sMI_DMRI51d.dat 0.0000 0.0000 NaN 0.000000 1.000000e+25
F62_sMI_St22d7.dat 1.7210 3.8330 0.237480 0.150000 1.091832e+01
F41_Car_HOC498d.dat 1.1670 2.8090 0.364190 0.300000 7.966335e+00
F78_MI_547d.dat 1.8970 5.4590 0.095319 NaN 2.593468e+01
Explanation:
说明：
print (df.isna())
alpha1 alpha2 gamma1 gamma2 chi2min
filename
M66_MI_NSRh35d32kpoints.dat False False False False False
F71_sMI_DMRI51d.dat False False True False False
F62_sMI_St22d7.dat False False False False False
F41_Car_HOC498d.dat False False False False False
F78_MI_547d.dat False False False True False
print (df.isna().any(axis=1))
filename
M66_MI_NSRh35d32kpoints.dat False
F71_sMI_DMRI51d.dat True
F62_sMI_St22d7.dat False
F41_Car_HOC498d.dat False
F78_MI_547d.dat True
dtype: bool
df1 = df[df.isna().any(axis=1)]
print (df1)
alpha1 alpha2 gamma1 gamma2 chi2min
filename
F71_sMI_DMRI51d.dat 0.000 0.000 NaN 0.0 1.000000e+25
F78_MI_547d.dat 1.897 5.459 0.095319 NaN 2.593468e+01
回答by Prateek Nagaria
Use df[df.isnull().any(axis=1)]for python 3.6 or above.
使用df[df.isnull().any(axis=1)]Python的3.6以上。
回答by user9194161
Suppose gamma1 and gamma2 are two such columns for which df.isnull().any()gives Truevalue , the following code can be used to print the rows.
假设gamma1 和 gamma2 是 df.isnull().any()给出Truevalue 的两个这样的列，以下代码可用于打印行。
bool1 = pd.isnull(df['gamma1'])
bool2 = pd.isnull(df['gamma2'])
df[bool1]
df[bool2]
