Python 辞書型の基本
目的
Python3で便利な辞書型の基本的なコードを書いて覚える。
辞書型データの作成
01 02 03 | >>> test_dict= {'key0':'value0','key1':'value1','key2':'value2'}>>> test_dict{'key0': 'value0', 'key1': 'value1'} |
要素の取り出し
01 02 03 04 05 06 07 08 | >>> test_dict['key0']'value0'>>> test_dict.get('key0')'value0'>>>test_dict.get('key3','No value3')'No value3' |
全キーの取得
01 02 03 04 05 | >>> test_dict.keys()dict_keys(['key0', 'key1', 'key2'])>>>list(test_dict.keys())['key0', 'key1', 'key2'] |
全値の取得
01 02 03 04 05 | >>> test_dict.values()dict_values(['value0', 'value1', 'value2'])>>> list(test_dict.values())['value0', 'value1', 'value2'] |
全キーおよび値の取得
01 02 03 04 05 | >>> test_dict.items()dict_items([('key0', 'value0'), ('key1', 'value1'), ('key2', 'value2')])>>> list(test_dict.items())[('key0', 'value0'), ('key1', 'value1'), ('key2', 'value2')] |
リスト型から辞書型への変換
01 02 03 | >>> test_list = [['key0','value0'],['key1','value1'],['key2','value2']]>>> dict(test_list){'key0': 'value0', 'key1': 'value1', 'key2': 'value2'} |
キーの有無確認
01 02 03 04 05 | >>> 'key3' in test_dictFalse>>> 'key2' in test_dictTrue |
要素の追加
01 02 03 | >>> test_dict['key3'] = 'value3'>>> test_dict{'key0': 'value0', 'key1': 'value1', 'key2': 'value2', 'key3': 'value3'} |
要素の削除
01 02 03 | >>> del test_dict['key3']>>> test_dict{'key0': 'value0', 'key1': 'value1', 'key2': 'value2'} |
辞書の結合
01 02 03 04 05 06 07 08 | >>> test_dict2= {'key3':'value3','key4':'value4'}>>> test_dict.update(test_dict2)>>> test_dict{'key0': 'value0', 'key1': 'value1', 'key2': 'value2', 'key3': 'value3', 'key4': 'value4'} |
要素の全削除
01 02 03 | >>> test_dict.clear()>>> test_dict{} |
