How to Convert Dictionary Keys to a List in Python 3?

How to Retrieve Dictionary Keys as a List in Python 3 and Beyond

Unlike Python 2.7, which returns a list of keys when calling newdict.keys(), Python 3.3 and later returns a dict_keys object. While the dict_keys object behaves similarly to a list, it may not be desirable in certain situations where a plain list is preferred.

Getting a List of Keys with Python 3

To obtain a list of keys from a Python 3 dictionary, simply convert the dict_keys object to a list:

list(newdict.keys())

For example:

newdict = {1: 0, 2: 0, 3: 0}
print(list(newdict.keys()))
# Output: [1, 2, 3]

Considering Duck Typing

It's worth noting that the dict_keys object behaves like a list in many ways, such as supporting iteration:

for key in newdict.keys():
    print(key)
# Output:
# 1
# 2
# 3

Therefore, unless specific use cases require a plain list, the dict_keys object may suffice.

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