如何删除 Python 中 JSON 文件中的特定值？

Question

So I got a JSON File looking like

{
    "banned": [123, 456]
}

What I want to do is removing only the value 123 of banned if possible with Python's JSON Module or Python itself.

What I tried:

with open("banned.json", "w") as bannedload:
    bannedjson = json.load(bannedload)
    bannedjson["banned"].pop(123)
    # json.dump(bannedjson, bannedload) This Line was just for testing

Second try:

 with open("banned.json", "w") as bannedload:
    bannedjson = json.load(bannedload)
    del bannedjson["banned"][123]
    # json.dump(bannedjson, bannedload) This Line was just for testing

So does anybody know how to do this?

Answer 1

Both del() and pop() works based on index of the element, you can use remove() method to delete the element as:

bannedjson["banned"].remove(123)

Note that remove() throws error if the element to be deleted does not exist in the list. You can use the in clause to check before deleting:

elt = 123
if elt in bannedjson["banned"]: 
    bannedjson["banned"].remove(elt)

Further, remove() only removes the first occurrence of the element and you can use list comprehension to remove all elements as:

elt = 123
bannedjson["banned"] = [element for element in bannedjson["banned"] if elt != element]