PythonでDictionary型のValueにnoneがないかを判定 #code

dict_nonecheck.py

def NoneCheckDict(dictionary):
    return list(map(lambda key: ('parameter \'%s\' is None' % key),
                    filter(lambda key: dictionary[key] is None, dictionary.keys())))


if __name__ == '__main__':
    # non None value
    params = {
        'aaa': 111,
        'bbb': 222,
        'ccc': 333
    }
    err = NoneCheckDict(params)
    print(err)
    # Output: []
    print(bool(err))
    # Output: False - no error

    # including None value
    params1 = {
        'aaa': None,
        'bbb': None,
        'ccc': 333
    }
    err = NoneCheckDict(params1)

    print(err)
    # Output: ['parameter 'aaa' is None', 'parameter 'bbb' is None']
    print(bool(err))
    # Output: True - error