def fr(n):
    for i in range(n):
        return i
    
def fy(n):
    for i in range(n):
        yield i

numr = fr(5)
numy = fy(5)
print(numr)
print(numr)
print('-------')
print(next(numy))
print(next(numy))
print(next(numy))
print(next(numy))
print(next(numy))

0
0
-------
0
1
2
3
4

def subgenerator():
    yield 'My'
    yield 'World'
    
def generator():
    yield 'Hello'
    yield from subgenerator() #Запрашиваем значение из субгенератора
    yield '!'
    
for i in generator():
    print(i, end = ' ')

Hello My World !

def f(n):
    for i in [x ** 2 for x in range(2, n + 1)]:
        yield i

num = f(5)
print(next(num))
print(next(num))
print(next(num))
print(next(num))

4
9
16
25