__lshift__

lshift.py

class Cell:
    def __init__(self, *args):
        self.stock = [*args]

    def __lshift__(self, value):
        self.stock.append(value)
        return self

if __name__ == '__main__':
    c = Cell('a', 'b', 'c')
    print(c.stock)
    c << 0 << 1 << 2
    print(c.stock)