find the range of all nodes in a linked list in python

main.py
class Node:
    def __init__(self, value):
        self.value = value
        self.next = None
 
def range_of_linked_list(head):
    if head is None:
        return None
    
    min_val = head.value
    max_val = head.value
    
    current = head
    while current is not None:
        if current.value < min_val:
            min_val = current.value
        elif current.value > max_val:
            max_val = current.value
        current = current.next
 
    return (min_val, max_val)
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