Why can't I use loop 'for i in...' in a definition? (Local Variable i not used)

Question

I'm new with Python and coding, doing some exercises online.

I am writing a class for making lists of random numbers:

class RandomList:
    def create_list(self):
        self.list = []
    def fill_list(self, min, max, range):
        self.list = [random.randint(min, max) for i in range(range)]

First of all --> I do not understand the Pycharm warning message under self.list = [] telling me:

"Instance attribute list is defined outside init"

What would be the difference if I wrote:

class RandomList:
    def __init__(self):
        self.list = []

Secondly --> The fill_list function doesn't work when I call RandomList.fill_list:

TypeError: 'int' object is not callable.

And there is a warning message under 'i':

Local Variable not used

I don't understand why

I am at loss here because when I use for example:

a = [random.randint(min, max) for i in range(range)]

outside of the class there is no issue whatsoever. I think I must be mixing things up here...

Answer 1

First: You can not use variable names with min, max, range

Example:

range = 4
for i in range(range): #you will get error
    print("Hello!")

Your code should be

class RandomList:
    def create_list(self):
        self.list = []
    def fill_list(self, minnum, maxnum, rangenum):
        self.list = [random.randint(minnum, maxnum) for i in range(rangenum)]

And you can test it with

randlist = RandomList
randlist.create_list(randlist)
randlist.fill_list(randlist, 1, 5, 3)

print(randlist.list) #prints randomly like [1, 4, 3]