I'm wondering why the set generated in my code isn't ordered from the smallest to the largest number. For instance, when I create a set like this:
```
a = set([4, 2, 1, 1, 3])
print(a) # {1, 2, 3, 4}
print("Set b is: ", set([5, 2, 1, 1, 3])) # Set b is: {1, 2, 3, 5}
print("Set c is: ", set([8, 5, 6, 7, 7])) # Set c is: {8, 5, 6, 7}
```
3 Answers
It's worth noting that the seemingly random ordering of sets can come from the underlying implementation in Python. It uses a hash table, which doesn't guarantee any specific order of elements. So, the results you see when printing a set can vary, and it's not a reflection of the elements themselves being ordered or unordered.
In Python, sets are inherently unordered, which means they don't maintain any specific order like lists do. Just because one set prints in a certain order doesn't mean the next one will follow the same pattern. So, set c being displayed as {8, 5, 6, 7} is just how it happens; it doesn't imply any specific ordering.
Great question! Sets are designed to be efficient for membership checking and to eliminate duplicates, not to maintain order. If you want a structure that keeps track of order, arrays or lists are a better fit. A simple way to sort your set is by using the `sorted()` function like this:
```
print(sorted(set([8, 5, 6, 7, 7])))
```
Exactly! `sorted()` will give you a nice ordered list from the set.
True! And sometimes the order can look like it's sorted, but that's just due to how CPython handles small integer values.