import sys
def a1_interned():
    lst = []
    for i in range(10**5):
        t = "a"
        t = t * 2
        # here ensure, that the string-object gets interned
        # returned value is the interned version
        t = sys.intern(t) 
        lst.append(t)
    return lst

print("len:", len({id(s) for s in a1_interned()}))
print("all aa:", all((s=="aa" for s in a1_interned())))