Python, how to manage multiple data in list or dictionary with calculations and FIFO

[Gribouillis]

For the rotating FIFO, you could use a collections.deque instance. You could also very easily implement a fixed length rotating structure with a list and a pointer, for example

class Rotating:
    def __init__(self, items):
        self.data = list(items)
        self.head = 0
        
    def __iter__(self):
        for i in range(len(self)):
            yield self[i]
    
    def __getitem__(self, i):
        return self.data[(i + self.head) % len(self)]
    
    def __len__(self):
        return len(self.data)
    
    def append(self, item):
        self.data[self.head] = item
        self.head = (self.head + 1) % len(self)
        
    def __str__(self):
        return 'Rotating({})'.format(
            self.data[self.head:] + self.data[:self.head])
    
R = Rotating('abcdef')
print(R)
R.append('g')
print(R)
R.append('h')
print(R)
print(R[0], len(R), R[5])
print(R.data)

Output:
Rotating(['a', 'b', 'c', 'd', 'e', 'f'])
Rotating(['b', 'c', 'd', 'e', 'f', 'g'])
Rotating(['c', 'd', 'e', 'f', 'g', 'h'])
c 6 h
['g', 'h', 'c', 'd', 'e', 'f']