How to use 'look for all column contains null values pandas' in Python

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20def none_missing(df, columns=None):
21 """
22 Asserts that there are no missing values (NaNs) in the DataFrame.
24 Parameters
25 ----------
26 df : DataFrame
27 columns : list
28 list of columns to restrict the check to
30 Returns
31 -------
32 df : DataFrame
33 same as the original
34 """
35 if columns is None:
36 columns = df.columns
37 try:
38 assert not df[columns].isnull().any().any()
39 except AssertionError as e:
40 missing = df[columns].isnull()
41 msg = generic.bad_locations(missing)
42 e.args = msg
43 raise
44 return df

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26def value_is_null(var_value):
27 """Check if the value is None or NaN."""
28 return var_value is None or pd.isna(var_value)

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