Python 3에서 Dict 키를 'dict_keys'에서 목록으로 변환하는 방법은 무엇입니까?

Converting Dict Keys from 'dict_keys' to List

In Python 2.7, obtaining dictionary keys as a list was straightforward using newdict.keys(). However, in Python 3.3 and later, this method returns a dict_keys object instead of a list.

To obtain a plain list of keys with Python 3, you can convert the dict_keys object using list(newdict.keys()). This will generate a list of keys that can be manipulated as needed.

Should You Convert?

While converting the dict_keys object to a list is possible, it's worth considering whether it's necessary. In most cases, the dict_keys object behaves similarly to a list. It supports iteration, allowing you to access and process keys efficiently.

For example:

for key in newdict.keys():
    print(key)

The above code will iterate over the keys of the newdict dictionary and print each key.

Extending Dict Keys

It's important to note that the dict_keys object does not support insertion of new keys using newdict[k] = v. If you need to add new keys to your dictionary, use the standard dict methods such as update() or setdefault().

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