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get columns that contain null values pandas

In [74]: df.columns[df.isna().any()].tolist()
Out[74]: ['a', 'b']
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How many columns have null values present in them? in pandas

import pandas as pd
df = pd.DataFrame({'a':[1,2,np.nan], 'b':[np.nan,1,np.nan],'c':[np.nan,2,np.nan], 'd':[np.nan,np.nan,np.nan]})
print(pd.isnull(df).sum())
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