def agenerator(a=42):
    print("First yield")
    yield 1
    if True:
        yield 2
    yield 3
    print("Into the loops")
    for i in range(a):
        yield i
        print("nest loop", i, a)
        for j in range(a):
            print("yielding",j)
            yield j
        print("Done with inner nest from",i)

print(list(agenerator()))