Using min() in python

Question

if I have a class:

class Number:
self.weight = x

and a list:
list =[ a, b, c]

and each element in a list has a weight in class, how do I use min to get the lowest element from the list according to its self. weight

I tried doing this: lowest = min(list, key = self. weight)

but that didn't work

Answer 1

That's not the right way to initialize a class property. Try this

class Number:
def __init__(self, w):
self.weight = w

Answer 2

If I correctly understood your question I think you should use a syntax like below:

lowest = min([Number_class_instance1.weight,Number_class_instance2.weight,Number_class_instance3.weight])

Answer 3

Okay.

If the items in the list are all Number objects, you can add a magic method to the class:

def __gt__(self, other):
return self.weight > other.weight

So you can just call, max(list) and get the greatest

Answer 4

for minimum add:

def __lt__(self, other):
return self.weight < other.weight

Answer 5

Consider that you've a list of Number class instances (for example named as "instances") that you don't know the length of that list now and in future. You can use something like this:

lowest= min([ i.weight for i in instances])

Answer 6

✔✅Barry🔧 i know, I was just too lazy to type it on my phone so I just used the quick way cause everyone understands anyways

Answer 7

ɧოɧ but what if we don't know how much elements are there in the list