count number of columns that are empty python code example

Example 1: number of columns with no missing values

null_cols = df.columns[df.isnull().all()]
df.drop(null_cols, axis = 1, inplace = True)

Example 2: count rows with nan pandas

np.count_nonzero(df.isnull().values)   
 np.count_nonzero(df.isnull())           # also works