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li = ['a','b','a','c','e','d','e','d']
print(list(dict.fromkeys(li).keys()))

In the provided code, there is a list `li` containing several elements, some of which may be duplicates. The goal of the code is to remove duplicates from the list while preserving the order of the remaining elements.

Let's break down the code step by step:

```python
li = ['a','b','a','c','e','d','e','d']
```

This line initializes a list `li` containing some elements, including duplicates.

```python
dict.fromkeys(li)
```

The `fromkeys()` method of the `dict` class is used to create a new dictionary where the elements of the list `li` are used as keys, and the values are set to `None`. This operation effectively removes duplicates because dictionary keys are unique, and duplicates are automatically eliminated.

However, it's important to note that dictionaries in Python do not guarantee the order of elements. So, using this method alone would not preserve the original order of elements in the list.

```python
list(dict.fromkeys(li).keys())
```

This line converts the keys of the dictionary back to a list. Since the keys of the dictionary are the unique elements of the original list `li`, this effectively removes duplicates from the list. The `.keys()` method returns a view of all the keys in the dictionary, and converting it to a list using `list()` ensures that the order of elements is preserved.

Here's what each part of the expression does:

- `dict.fromkeys(li)`: Creates a dictionary with unique elements of `li` as keys.
- `.keys()`: Gets a view of all keys in the dictionary.
- `list(...)`: Converts the keys view to a list, preserving the order of elements.

So, the final result of the expression is a list containing the unique elements of the original list `li`, with the order preserved. In this case, it would be `['a', 'b', 'c', 'e', 'd']`.

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