python3: yield from

python3: yield from

Python 3: Using "yield from" in Generators - Part 1

yield from 后面跟一个generator。

def generator2():
    for i in range(4):
        yield i

def generator3():
    for j in range(4, 8):
        yield j

def generator():
    for i in generator2():
        yield i
    for j in generator3():
        yield j

for i in generator():
    print(i)

运行结果以下：

$ python3 test.py 
0
1
2
3
4
5
6
7

能够用yield from简化代码：

def generator2():
    for i in range(4):
        yield i

def generator3():
    for j in range(4, 8):
        yield j

def generator():
    yield from generator2()
    yield from generator3()

for i in generator():
    print(i)