生成器

# a = [x for x in range(1,10)]
# print(a)

def f(n):

    return n*2

b = [f(x) for x in range(1,10)]    #生成器1

print(b)

aa = ("abd")
print(aa[0])
print(aa[1])
print(aa[2])
t = ("ab",2)
f,g = t
print(t[0])
print(g)
s = (s for s in range(1,10))       #生成器2
# print("ss:",next(s))
# print("ss:",next(s))
# print("ss:",next(s))
# print("ss:",next(s))
# print("ss:",next(s))
for i in s:
    print("这是",i)



def foos():
    print("ok")
    yield 1          #生成器3

    print("ok2")
    yield 2
fg = foos()
# for i in foo():
#     print(i)

next(fg)
next(fg)

-----------------------------------------------------------


def foo():
    print("ok1")
    ss = yield 1
    print(ss)

    print("ok2")
    yield 2
ff = foo()
ff.send(None) #相当于next(ff) 生成器
ccc = ff.send("abc")
print(ccc)

----------------------------------------------------------------------------

def foo():
    print("qq")
    yield 1

    print("ww")
    yield 2

f = foo()
print(next(f))
print(next(f))