Deleting first item in python dict using indexes-CodePudding

I am working with dictionaries and I would like to delete the first item of the dictionary. Is there any way to do that using indexes?

CodePudding user response：

Similar to @Yevgeniy-Kosmak above but you can avoid allocating the list of keys and use a lazy iterator. This will be friendlier to memory with large dicts:

d = {
    'x': 100,
    'y': 200,
    'z': 300
}

del d[next(iter(d))]

d
# {'y': 200, 'z': 300}

Of course, this should include a caveat that if you are depending on the order of things, a dictionary may not be the best choice of data structure.

CodePudding user response：

In Python dictionaries preserve insertion order. So if you want to delete the first inserted (key, value) pair from it you can do it this way, for example:

>>> d = {"one": 1, "two": 2, "three": 3, "four": 4}
>>> del d[list(d.keys())[0]]
>>> print(d)
{'two': 2, 'three': 3, 'four': 4}

Documentation is here.