[Python] Python __iter__ and __repr__ what they doing?

I am currently working on LinkedList and I have the following code and I don't understand what the __iter__ and __repr__ are doing exactly?

class Node:
def __init__(self, value):
self.value = value
self.next = None

class LinkedList:
def __init__(self):
self.head = None

def append(self, value):
if self.head is None:
self.head = Node(value)
return

node = self.head
while node.next:
node = node.next

node.next = Node(value)

def __iter__(self):
node = self.head
while node:
yield node.value
node = node.next

def __repr__(self):
return str([v for v in self])


Here I am creating the LinkedList and append the values at the end of my list.

llist = LinkedList()
for value in [4,2,5,1,-3,0]:
llist.append(value)


If I print the list print(llist) then I am getting [4, 2, 5, 1, -3, 0]

I guess this is coming from __iter__ and __repr__. What I don't understand is when my __iter__ and __repr__ starts and which is running first? How can I print objects outside my class?

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