[英]Is there a way to update the value of a Python dictionary but not add the key if it doesn't exist?
[英]Python dictionary comprehension checking if something doesn't exist and setting a value
我有一本這樣的字典
old_dict = {"language":"english","gender":"female","job":"ceo"}
我唯一感興趣的鍵是“語言”,“工作”,“愛好”
使用此邏輯過濾掉僅適用於原始字典中存在的鍵。
dict_you_want = { your_key: old_dict[your_key] for your_key in your_keys if your_key in your_keys }
如果鍵不存在,則如何更改此代碼以添加條件,以便為鍵設置null / none值。
your_keys = ["language","job"]
我正在尋找的輸出是
{"language":"english","job":"ceo","hobby":None}
{ key:old_dict.get(key,None) for key in ["language","job", "hobby"]}
輸出:
{'hobby': None, 'job': 'ceo', 'language': 'english'}
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