def func():    print("111")    yield 222 ret = func()
print(ret) 结果:
<generator object func at 0x10567ff68>

def func():    print("111")    yield 222    print("333")    yield 444 gener = func()
ret = gener.__next__()
print(ret)
ret2 = gener.__next__()
print(ret2)
ret3 = gener.__next__()  # 最后⼀一个yield执行完毕. 再次__next__()程序报错, 也就是 说. 和return无关了了.
print(ret3) 结果: 111
Traceback (most recent call last):
222
333
File "/Users/sylar/PycharmProjects/oldboy/iterator.py", line 55, in <module>
444    ret3 = gener.__next__()  # 最后⼀一个yield执行完毕. 再次__next__()程序报错, 也 就是说. 和return无关了了. StopIteration

def func():    print(111)    yield 222    print(333)    yield 444    print(555)    yield 666 gen = func()
for i in gen:    print(i) 结果:
111
222
333
444
555
666

lst = [i for i in range(1, 15)]
print(lst)

gen = (i for i in range(10))
print(gen) 结果:
<generator object <genexpr> at 0x106768f10> 

# 获取1-100内能被3整除的数
gen = (i for i in range(1,100) if i % 3 == 0)
for num in gen:    print(num) # 100以内能被3整除的数的平方
gen = (i * i for i in range(100) if i % 3 == 0)
for num in gen:    print(num) # 寻找名字中带有两个e的人的名字
names = [['Tom', 'Billy', 'Jefferson', 'Andrew', 'Wesley', 'Steven', 'Joe'],          ['Alice', 'Jill', 'Ana', 'Wendy', 'Jennifer', 'Sherry', 'Eva']] # 不用推导式和表达式
result = []
for first in names:    for name in first:        if name.count("e") >= 2:            result.append(name) print(result) # 推导式
gen = (name for first in names for name in first if name.count("e") >= 2)
for name in gen:    print(name)    

def func():    print(111)    yield 222 g = func()  # 生成器g
g1 = (i for i in g) # 生成器g1. 但是g1的数据来源于g
g2 = (i for i in g1)    # 生成器g2. 来源g1 print(list(g))  # 获取g中的数据. 这时func()才会被执行. 打印111.获取到222. g完毕.
print(list(g1))  # 获取g1中的数据. g1的数据来源是g. 但是g已经取完了. g1也就没有数据了
print(list(g2))  # 和g1同理

# 把字典中的key和value互换
dic = {'a': 1, 'b': '2'}
new_dic = {dic[key]: key for key in dic}
print(new_dic) # 在以下list中. 从lst1中获取的数据和lst2中相对应的位置的数据组成一个新字典
lst1 = ['jay', 'jj', 'sylar']
lst2 = ['周杰伦', '林俊杰', '邱彦涛']
dic = {lst1[i]: lst2[i] for i in range(len(lst1))}
print(dic)

lst = [1, -1, 8, -8, 12]
# 绝对值去重 

s = {abs(i) for i in lst}
print(s)

def add(a, b):    return a + bdef test():    for r_i in range(4):        yield r_ig = test()  for n in [2, 10]:    g = (add(n, i) for i in g)print(list(g))结果:
[20,21,22,23]