random.shuffle(list) to randomize the order of the elements in the list after importing the random module with
import random. This shuffles the list in place. If you need to create a new list with shuffled elements and leave the original one unchanged, use slicing
list[:] to copy the list and call the shuffle function on the copied list.
Problem: You’ve got a Python list and you want to randomly reorder all elements?
Solution: No problem, use the shuffle function in Python’s
Example: Here’s some code to show you how to do this:
import random a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] random.shuffle(a) print(a) # [6, 8, 5, 7, 2, 3, 9, 1, 4, 0] random.shuffle(a) print(a) # [8, 4, 9, 2, 6, 3, 5, 7, 0, 1] random.shuffle(a) print(a) # [1, 0, 7, 2, 4, 9, 5, 8, 3, 6] random.shuffle(a) print(a) # [4, 6, 0, 5, 1, 3, 9, 2, 7, 8]
As the elements are randomly reordered, the result will look different when you’ll execute the same code snippet. Like any random function, the behavior is non-deterministic. Please also note that the list itself is shuffled—there’s no new list created.
You can try it yourself in the following interactive Python shell:
How to Shuffle and Return a New List?
random.shuffle(a) method modifies an existing list
a. It works in-place. So, what if you want to shuffle the original list but return a new list while leaving the original list elements unchanged?
No problem—use slicing to copy the list.
import random a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] b = a[:] random.shuffle(b) print(b)
Exercise: Take a guess—what’s the output of this code snippet? You can check your guess in our interactive code shell:
Where to Go From Here?
Enough theory, let’s get some practice!
To become successful in coding, you need to get out there and solve real problems for real people. That’s how you can become a six-figure earner easily. And that’s how you polish the skills you really need in practice. After all, what’s the use of learning theory that nobody ever needs?
Practice projects is how you sharpen your saw in coding!
Do you want to become a code master by focusing on practical code projects that actually earn you money and solve problems for people?
Then become a Python freelance developer! It’s the best way of approaching the task of improving your Python skills—even if you are a complete beginner.
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