Python3 迭代器,生成器,装饰器

a='abcdef'
b=iter(a)	#创建迭代器对象
print(type(b))

while True:
	try:
		print(next(b))
	except StopIteration:
		break

def gen():
	yield 'a'
	yield 'b'
	yield 'c'


g=gen()
print(type(g))
while True:
	try:
		print(next(g))
	except StopIteration:
		break

def gen(n):
	while n>0:
		print('Berofe')
		return n
		n-=1
		print('After')

g=gen(3)
print(g)

def gen(n):
	while n>0:
		print('Berofe')
		yield n
		n-=1
		print('After')

g=gen(3)
while True:
	try:
		print(next(g))
                print('------------')
	except StopIteration:
		break