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Super Useful Trick in Python #python #coding #programming
- February 12, 2024
- Posted by: MainInstructor
- Category: Python
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Video Title: Super Useful Trick in Python #python #coding #programming
Video Keywords: Python
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as far as my knowledge brings me, this problem can be solved through that for-loop append if the element is not in new list already.
Although a one-liner:
new_list = [i for i in old_list if i not in new_list]
is concise, its worst big-O is O(n^2), (someone in the comment pointed it out :D, ) we can use the for-loop and binary search to reduce the big-O to O(n + log n).
Is there a better way?
new = sorted(list(set(old_list)))
L = ['a', 'b', 'c', 'a', 'b']
unique_list = list(dict.fromkeys(L))
This video is a crime
This is fine if you keep the old_list's elements into ascending order. But, if you change the order of the elements then you will not get an ascending new llist:
oldList = ['m','n','k','o','l','k']
newList = list(dict.fromkeys(oldList).keys())
print(newList)
such a neat way of doing it
Check this code
l=['a','d','c','s','b','a','s']
w=sorted(set(l))
print(w)
As told, it only works because dict are now ordered
But there is also ordered set.
And this solution is not very generic since you don't support various keys (like sort support key attribute)
I would rather take a few more lines to create my own utility
def uniquify(iterable, /, key=lambda x: x):
…
The syntax is wrong, there are two parentheses on the left and one on the right. Wtf
List(set())
ıse this insted dict.fromkeys(old_list).keys()
Straight to Gaza, right away
this guy uses the same method. Was this stolen? https://youtube.com/shorts/WqKd3mHYeA8?si=D0GCq4_NYYlC_etR
An better way is:
old_list = ["k","l","k","m","m","n","o"]
new_list = [i for idx,i in enumerate(old_list) if i not in old_list[:idx]]
This makes me sick 🤢 🤮
Only works because dict is ordered which came in Python 3.8
which is the fastest method though
Could just do .unique() in pandas
I made the first video about my project in python, i will be happy to get your feedback ❤
But after you get a dictionary… why would you like to have this heresy in your code? Why do you hate program efficiency so much? 😄
nice wayyyy
list to set naaaa?
this is ok but I don't think something almost everyone is doing is called a trick. (I might be wrong though)
Any computer scientist is screaming in pain after watching this video😂
Basically:
1. Method convert it to a set which contains unique values but that would mean changing the data type.
2. Method is to make an empty list and iterate through the old list and if the item is not in the new list then add the element.
new_list = list(dict.fromkeys(old_list))