CODEWITHSUNDEEP
pythonlistobjectpython-object
user4171415
user4171415

Reputation:

Naming objects created in a loop

I want to create a loop that creates an object if a certain condition is met and then adding it to a list. However, I am unsure how to uniquely name these objects so they can be used/referenced later on. For example something like this:

favNumbers = []

numbers = [6, 21, 5, 22]

class favNumber(object):
    def __init__(self, value):
        self.value = value

for i in numbers:
    if i % 2 == 0:
        unique_name_for_object = favNumber(i)
        favNumbers.append(unique_name_for_object)

How would I gave the favNumber objects a unique name?

I was thinking of somehow naming them number1, number2, number3... but I think dynamically naming them would be a bad idea.

Is there a way of doing it without dynamically naming them? It seems as if that would be impossible but I am unsure as to how else I could accomplish it.

Upvotes: 0

Views: 448

Answers (2)

SwiftsNamesake
SwiftsNamesake

Reputation: 1578

If you simply want to generate a list, you can use a list comprehension:

favNumbers = [favNumber(i) for i in numbers if n % 2 == 0]

The last expression (if n % n == 0) acts as a filter. To access the values, you use an index (eg. favNumbers[0] for the first item), or loop through the list like you did with numbers.

As someone pointed out in the comments, {} is a dict and cannot be appended to. You can however insert items given a key (which might as well be the integer i, although it usually makes more sense to use lists when the keys are consecutive non-negative integers).

for i in numbers:
  if n % 2 == 0:
    favNumbers[i] = favNumber(i)

It can also be done with a dictionary comprehension:

favNumbers = { i : favNumber(i) for i in numbers if n % n == 0 }

I'll update the answer if you provide additional context.

Upvotes: 0

MaxPowers
MaxPowers

Reputation: 5486

There is no need to name the instances. Just try this one

favNumbers = []   
numbers = [6, 21, 5, 22]


class favNumber(object):
    def __init__(self, value):
        self.value = value


for i in numbers:
    if i % 2 == 0:
        favNumbers.append( favNumber(i) )

Now, favNumbers is a list of all created instances. If you want to get the value ot the each instance, just type

for fn in favNumbers:
    print(fn.value)

Upvotes: 1

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