根据PEP8，字典中的长行

my_dict = {
    'key1': 'value1',
    'key2': 'value2',
    'key3': 'value3',
    'key4': 'value4',
    'key5': 'value5',
    'key6': 'value6',
    'key7': 'value7',
    'key8': 'value8',
    'key9': 'value9',
    'key10': 'value10',
    'key11': 'value11',
    'key12': 'value12',
    'key13': 'value13',
    'key14': 'value14',
    'key15': 'value15',
    'key16': 'value16',
    'key17': 'value17',
    'key18': 'value18',
    'key19': 'value19',
    'key20': 'value20'
}